Genetics

Statement of the overall results The frequencies matched and no number was off meaning that the Hardy Weinberg principle was used correctly. When counting and figuring out the two different equations the numbers fit together. ‘V. Materials: 1. 100 blue beads 2. 100 white beads 3. Two containers to put the beads in 4. Paper 5. Pencil 6. Calculator V. Results/Data: Figure 1 In the above picture labeled “Figure 1”, the simulation of the production of 100 offspring was recorded. This came from random mating of the “parental population” (the blue and white beads).

Each offspring is represented by a pair of beads (which represent the gametes), the genotypes are as follows; B, B, b their frequencies are recorded in the table below: Table 1 Genotype Frequency Bad-homozygous dominant 26 B-heterozygous 50 b-homozygous recessive 24 Alleles B- black fur 103 b- white fur 97 A. The Hardy-Weinberg Principle predicts that genotypes frequencies of offspring will be the same as those of the parental generation. This prediction Was true for this lab, this conclusion can be made because all Of the offspring were either of black and or white fur.

B. There are five major assumptions for the Hardy-Weinberg equilibrium, if one of them was violated then the frequencies would end up being different, NY one of them could cause this, most likely the mutation one because that would cause for different offspring to happen and thus for different frequencies. Genotype Frequency Table Frequency 0. 26 0. 5 b 0. 24 Phenotype Frequency Table Phenotype B 0. 51 0. 49 A. There are 200 alleles present for the trait of fur color. B. There are a total of 100 beads to represent black fur and 100 beads to represent white fur.

C. 1 00 beads represent the population. VI. Conclusions: The hypothesis “If students follow the Hardy Weinberg directions properly then their traits will fit into the law because no other evolutionary influences ill interrupt this lab” is accepted. The hypothesis made at the beginning of the lab was accepted because the students did follow the Hardy Weinberg directions properly and their traits did fit into the Hardy Weinberg law because none of the frequencies came out wrong.

It can be concluded that none of the five major assumptions for Hardy Weinberg were violated which is why the frequencies fit into the law. The lab relates to the lecture because students are currently discussing evolution and how it works. The Hardy Weinberg principle involves evolution because it discusses how genotype regencies would be if no other evolutionary influences were present. Something that doesn’t necessarily happen since in the real world there are evolutionary influences present all over the world and in all of the populations.

The lab is significant because it allows students to see how the world would be if we didn’t have any evolutionary influences present in our world, influences such as mutations, natural selection, genetic drift/migration, etc. The lab relates to the real life because it helps to explain why humans and other earth’s organisms are the way they are, and that is because of evolution. Evolution has helped humans to become more resistant to diseases, and it has helped some organisms survive for as long as possible (or at least long enough to reproduce).

If real life was the way the Hardy Weinberg principle requires it to be then some organisms on earth wouldn’t be here, this is something that this lab allowed students to understand. The lab can be applied to the scientific field of genetics. The lab can be applied to this field because geneticists look at organisms genes and by understanding the Hardy Weinberg principle then they would understand the way evolution arks and how it affects the different genes that different organisms have.

The lab could improve by having smaller groups, this improvement is needed because it is hard for such big groups to do math together. There were times were one person would count a specific amount of beads and then the other two partners would count something different and then the whole group would get really confused which is why it would be better to have smaller groups to avoid the confusion. Another improvement would be to obtain more beads, maybe this was the reason such big groups were made, so if ore beads were available then smaller groups would be made.

One error would be the one described above, students were having a hard time with keeping count of their beads, one way to avoid this without making smaller groups would be to write down the numbers and not split up the numbers between group members. Another error was that some beads were dropped and thus the numbers were messed up, a way to avoid this would be to have bigger beads that won’t fall so easily. A new question that students could investigate would be, what if their parental population mixed with another group? R what if a new bead color (new population) was introduced? VI. Lab Questions: 1 .

Allele- one of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome. 2. Gene- a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring. 3. Dominant allele- An allele that expresses its phenotypes effect even when heterozygous with a recessive allele. This one is the stronger allele. 4. Recessive allele- The opposite of a dominant allele, this one has a weaker allele. . Homozygous- a pair of matching alleles, which are the two genes that control a particular trait. 6.

Heterozygous- a pair Of genes where one is dominant and one is recessive Verifying the Hardy-Weinberg Principle 1 . There are five conditions that a population must meet in order to be in the Hardy-Weinberg equilibrium, those conditions are as follows; No genetic drift, No migration, No mutation, No selection, and random mating so no differential reproduction. 2. The percent for the recessive allele is 30, meaning that the left over is the percent for the dominant allele: 70%. With Hardy Weinberg second equation (pap+ups+qua -? 1) one can see that the heterozygous is represented by the (ups) part, by putting the numbers in place ( xx . X . 3) then the answer would be obtained, which is 42. 42 is the frequency of the dominant allele. 3. The frequency for the dominant allele is 0. 51 when the frequency of the homozygous dominant genotype is . 49 4. If the frequency of the homozygous recessive genotype is 0. 36 then the frequency of the dominant allele is 0. 64. 5. Fifth frequency of the homozygous dominant genotype is 0. 49 then the frequency of the anonymous recessive genotype is 0. 51 6. The two Hardy Weinberg Equations are: up + ups + q = 1 a.

The first equation (p + q = 1) relates to the frequencies of the alleles at a particular gene locus b. The second equation (up + ups + q = 1) relates to the frequencies of the genotypes for a particular gene locus. C. The first equation (p + q = 1) relates to the frequencies of the phenotypes for a gene. Questions for Further Thought 1 . Natural selection allows for the “sundial of the fittest” meaning that if there is a human who has no mouth then this human will not survive because he/ he cannot feed and thus will be selected to die and not reproduce because it is not adapted to fir environment.

A perfect, real example are finches, they have different beaks because they have accommodated their bodies depending to the environment, these beaks will allow them to survive more than the other finches who haven’t gone through natural selection. 2. Natural selection is the process whereby organisms better adapted to their environment tend to survive and produce more offspring. It can drive evolution because it can change the population and eventually the whole population will be changed because those organisms are the ones that survived and lived on, the ones that didn’t survive didn’t successfully go through natural selection.

Life Cycle of Bacteriophage. Bacteriophage: Bacteria eating virus is called bacteriophage. Life Cycles: There are 2 types of lifecycles that occur in the bacteriophage: 1) Lytic Cycle 2) Lysogenic Cycle 1) Lytic Cycle: In lytic cycle, virus that is the bacteriophage causes lysis of the host cell. It is virulent phage. 2) Lysogenic Cycle: In lysogenic cycle, the bacteriophage does not cause lysis of host’s cell. It is avirulent phage. Lytic Cycle. Landing, Penetration and Attachment

To infect a cell, a virus must first enter the cell through the plasma membrane and (if present) the cell wall. Viruses do so by either attaching to a receptor on the cell’s surface or by simple mechanical force using tail fibers. Attachment is done with the help of receptors. Control The virus then releases its genetic material (either single- or double-stranded RNA or DNA) into the cell. In doing this, the cell is infected and can also be targeted by the immune system. This relation is called master-slave relation.

Biosynthesis The virus’ nucleic acid uses the host cell’s machinery to make large amounts of viral components. For DNA viruses, the DNA transcribes itself into messenger RNA (mRNA) molecules which are afterwards used to control the cell’s ribosomes. The first polypeptides that are translated destroy the host’s DNA. In retroviruses , an enzyme called reverse transcriptase translates the viral RNA into DNA, which is then translated again into RNA. Assembly New viruses are formed by the assembly of the different parts of the virus.

After approximately 25 minutes, 200 new viruses are formed. Release Bacterial cell burst and the newly formed viruses are released from the host cell. Now, they are ready to attack new bacteria. Lysogenic Cycle. Landing The first step of lysogenic cycle is landing of the virus on the host’s cell. This is done by tail fibers. Attachment It is done with the help of receptors present on the surface of the bacterial cell wall. Penetration For the penetration the tail fibers of the bacteriophage secrete special enzymes for the lysis of bacterial cell wall called, “lysozyme. Then by the contraction of tail fibers and sheath viral DNA is injected into bacterial cell. Incorporation Viral DNA after penetration becomes incorporated (inserted) into bacterial DNA. This state is called prophage and this relation is called “host-guest” relation. Bacterial Division Bacteria divides and the daughter bacterial cell receives the viral DNA. These bacterial cells having viral DNA are resistant to viral attack. Induction During lysogenic cycle when viral DNA detaches from bacterial DNA, and take control over bacterial DNA. Now, lytic cycle begins.

A. sativa is an economically important crop and ranks sixth in world cereal production after wheat, rice, maize barley and sorghum (FAO, 2012). It is an important role as food for human and feed for animals in central high lands of Ethiopia; it is one of the best dual-purpose cereal crops. Ethiopia as a region with wide altitudinal range, substantial temperature, and rainfall differences with diverse edaphic conditions create a wide range of agro-ecological conditions and microenvironments.

Ethiopia, is considered as a secondary center of diversity for the oat, little has so far been done towards determining the genetic diversity, population structure and acid soil tolerance capacity screening of Ethiopian oat accessions. More nutritious and high yielding oat varieties are needed to run an efficient livestock industry as well as to secure human food security on which dependence of increasing population is taking ride.

So, it becomes important to take advantage of the germplasm available to develop the superior cultivars for specific needs.Thus, the present study was undertaken to identify or catalogue oats genotypes along with the assessment of genetic diversity prevalent in different geographical regions in the country and from USA, Netherlands and Australia.

The 176 oat accessions were used for the present investigation and they were sown in a RCBD design with two replications at each site. Observations were recorded on various morpho-agronomic characters viz; plant height (cm), internode length (cm), number of nodes per main stem of a plant, number of tillers /plant, Flag leaf length (cm), length of panicle (cm), number of spikelets per panicle, days to 50% flowering, days to maturity, biological yield per m2 (g), grain yield per m2 (g), and harvest index (%).

This study also provides one of the first reported investigations of association analysis in a diverse population of oat, and thus, it will provide a useful benchmark for comparison with future results and with results from other species. Accurate assessment of the levels and patterns of genetic diversity has tremendous importance in the analysis of genetic variability in cultivars; identifying diverse parental combinations to create segregating progenies with maximum genetic variability for further selection; and introgression of genes from more exotic germplasm to broaden the genetic diversity of oats.

The results obtained in our study provide a better understanding of genetic diversity along with its aluminium tolerance from different regions of Ethiopia as well as USA and Netherlands and Australia oat germplasm accessionsBased on molecular and agro morphological data there are no clear differentiation between populations; the population that were analyzed as genus level, A. sativa population and A. abyssinica population.

The present study revealed that the oat accessions had significant wide range variability with respect to qualitative and quantitative traits. Moreover, the variations observed (both qualitatively and quantitatively) were fairly distributed across the regions/populations the accessions were collected from. These indicated potential genetic diversity prevalent in oat accessions, which can be harnessed future breeding and conservation endeavors in Ethiopia.

A high genetic diversity exists in Ethiopian accessions as well as in USA and Netherlands- Australia accessions. There is a significantly higher variation within the populations than among the populations. In addition, there is a significantly higher variation within cultivated as well as within wild than among the cultivated and among wild. Furthermore, there is a significantly higher variation within species than among the species.The molecular diversity analysis was carried out using 19 SSR markers in all the 176 germplasm.

The SSR markers showed clear differentiation between wild and cultivated, but they failed to differentiate from Ethiopian and USA and Netherlands-Australia cultivated oat accessions. The following molecular data were recorded for allelic parameters like, number of alleles/effective alleles; average heterozygosity; genetic diversity; and Polymorphic Information Content (PIC), demonstrating the availability of adequate genetic diversity in the wild oat accessions that can be exploited in the future.

These variations in the allelic parameters were also noticeable across regions/populations sites. Peculiarly, the geographic populations, Shewa and Gondar and Arsi, had the most excessive number of effective alleles in 176 oat accessions the whole, 81 A. sativa accessions, and A. abyssinica accessions; and expected/unbiased expected heterozygosity measures.

This indicated that these regions possess higher importance towards through introgression desirable genes into other oat genotypes in Ethiopia.

The following molecular data were recorded for allelic parameters like, number of alleles/effective alleles; average heterozygosity; genetic diversity; and Polymorphic Information Content (PIC), demonstrating the availability of adequate genetic diversity in the wild oat accessions that can be exploited in the future.

These variations in the allelic parameters were also noticeable across regions/populations sites. Peculiarly, the geographic populations, Shewa and Gondar and Arsi, had the most excessive number of effective alleles in 176 oat accessions the whole, 81 A. sativa accessions, and A. abyssinica accessions.

This indicated that these regions possess higher importance towards through introgression desirable genes into other oat genotypes in Ethiopia.Cluster analysis grouped 176 genotypes into five clusters whereby the individuals within any one cluster are more closely related than are individuals in different clusters.

Our expectations were, the hexaploid specie might be grouped together and tetraploid species may have clustered together, while hexaploid and tetraploid species should have to be clustered separately since they possessed different genome. unlikely to our expectation the result showed that hexaploid and tetraploid were grouped together.

Clustering these groups were similar both in molecular and agro-morphological data. Similar results were found for molecular data. The DARwin 5.0 software was used to generate the dendrogram. All the genotypes were clustered into 3 clusters of different sizes. On the other hand, results of PCA and various recorded values of important agro-morphological descriptors were jointly used to determine the groups identified in the molecular analysis at a STRUCTURE present k=2.

As a result, the first group, USA and the Netherlands – Australia belonged to the cultivated oats, A. sativa; whilst the second groups were predominated by accessions from the Ethiopia, both cultivated and wild. Consequently, it was concluded that Cultivated oat groups had higher genetic diversity than their respective Wild oat counterparts in Ethiopian oat germplasm.

The current study showed that Root Length (RL) was affected more by Al toxicity. Lower Al toxicity levels less than 50 µM had no significant effect on the growth performance in most oat accessions, while the growth of RL showed a decline with increasing Al concentration and toxicity levels. The impact of Al toxicity on oats germplasm became influential upon toxicity level increments.

The optimum Al3+ concentration for tolerance level could be 112.5 µM oats. Thus, these accessions should not be recommended in area where soil acidity is predominant. However, A. vaviloviana accessions were highly Al tolerant as revealed by root growth performance and can be promoted in area where soil acidity is a challenge. This study is the first of its kind to evaluate the performance of Ethiopian oats to Al-toxicity.

The study clearly showed the possibility of developing lines and genotypes that can tolerate acidity in Ethiopian context and support agricultural development in acidic soil area in the country. In conclusion, the present study generated unique outcomes in terms of directing the phenotypic and molecular genetic diversity; population structure of the genepools; and to identity of sub-groups up to the species level. It is considered to put the platform for future breeding and genetic resource conservation programs in Ethiopia.

A genetically changed organism may be associate animal, plant, or micro-organism (e.g. bacteria) whose sequencetic makeup is altered through gene splice, genetic modification, or transgenic technology. This manipulation of genes and DNA has the potential to make combos of animal, bacterial, plant, and infective agent genes that either don’t or wouldn’t naturally manifest in nature through ancient crossbreeding strategies.

It’s the unstable qualities created by these scientific manipulations, and a scarcity of long study and analysis on the impact such manipulations will produce, that has several scientists and members of the overall public involved.How genetically changed foods created? When genetically modifying plants that square measure used for food, scientists take away specific genes from the DNA of another organism, like associate animal, bacterium, plant, or virus and so add those genes into the DNA of the plant they require to change.

This method is usually mentioned as sequence splice. By adding completely different genes, scientists hope the plant can inherit the characteristics contained inside the spliced section of DNA.

What Is Zucchini

Also known as courgette, zucchini has its origin in America and is obtainable in yellow, lightweight inexperienced, and inexperienced color. the form of this tiny summer squash resembles that of a ridged cucumber and options various seeds. Some cultivators conjointly manufacture zucchini in rounded or bottle shapes.

Today, the most important producers of this squash embody Japan, China, Romania, Italy, Turkey, Egypt, and Argentina. it’s adult year-around and may be eaten raw, sliced or in lyonnaise kind. It may be cut in an exceedingly cold dish and is additionally lyonnaise in hot salads.

Even though zucchini could be a fruit, it’s sometimes lyonnaise as a vegetable because it’s best once eaten in lyonnaise dishes. it’s picked once it’s below 8in/20cm long and also the seeds square measure soft and young. a totally developed zucchini is sometimes 3 feet long and contains an excessive amount of fiber and isn’t smart to eat.

Young zucchini incorporates a delicate style, soft covering, and buttery white flesh. it’s obtainable in its best kind throughout might and July. the majority the elements of this squash square measure edible, together with the flesh, seeds, and even the skin.Varieties of zucchini: Some widespread varieties are:

• Golden zucchini options brght golden-yellow skin that retains its color even once preparation.
• Round sorts square measure dense, heavy, and nearly seeded with a swish surface.
• Tatume, that is common in Mexico, has similar options of spherical selection however has the big oval form.
• Costata Romanesco conjointly called Cocozelle could be a long, slender sort with a small bulge at very cheap finish. It options pale, raised ribs with dappled inexperienced skin. once sturdy and young, this squash is juicy and sweet.
• Middle-Eastern sorts square measure fat, lightweight inexperienced, tapering ends with a thick greenish stem. they need swish, shiny skin and firm, crisp and flavourous flesh.
• Yellow Crooknecks have thick unsmooth skin with a markedly falcate neck. they’re fresh in texture with sweet, delicate flavor.

Health Edges Of Zucchini

Health edges of zucchini embody the following;Weight Loss: You might be shocked to grasp that overwhelming zucchini can assist you melt off significantly. it’s very low in calories, however it provides you the sensation of being full. Therefore, it’s a good thanks to satisfy your appetency while not grabbing calories or beginning a crash diet set up. with the exception of the low-calorie count, it’s high water content and is made in fiber. Hence, once you eat it, your abdomen isn’t empty, thereby creating zucchini recipes excellent if you’re on a diet.

Maintains Best Health

Already being an impressive supply of metal and ascorbic acid, zucchini is additionally the most effective supply of dietary fiber that may keep your body within the best form for the end of the day. It conjointly contains axerophthol, magnesium, folate, potassium, copper, and phosphorus. This summer squash conjointly incorporates a high content of omega-3 fatty acid fatty acids, zinc, niacin, and macromolecule. Moreover, vitamin B1, vitamin B6, vitamin B2, and atomic number 20 in zucchini assure best health. it’s most likely the most effective squash having associate array of nutrients, together with sugar, carbohydrates, soluble and insoluble fiber, sodium, minerals, amino acids, and more. The B-complex vitamin ingredient of this squash is very suggested for pregnant girls additionally.

Promotes Men’s Health

Many researchers have taken extracts from this squash to conduct sure studies associated over that this fruit has sure properties that effectively treat an ill in men known as benign prostatic hyperplasia or Benign endocrine Hypertrophy. Benign prostatic hyperplasia could be a condition wherever the ductless gland becomes enlarged in associate odd form and size, that then will cause hassle with each sexual and urinary operate. an honest treatment of this is often seen together with different foods that contain phytonutrients; zucchini is claimed to be very helpful in decreasing benign prostatic hyperplasia symptoms.

Prevents Diseases

Your overall health can for certain improve if you consume zucchini frequently. It helps forestall all types of diseases in an exceedingly general sense. Studies have already declared that fiber-rich foods facilitate alleviate cancer conditions by laundry away cancer-causing toxins from cells within the colon. The ascorbic acid, folate, and carotenoid in zucchini facilitate to safeguard these cells from the harmful chemicals that may result in carcinoma. carotenoid and ascorbic acid even have medicine properties, thereby naturally solidification ailments like arthritis, asthma, and arthritis, wherever swelling is vastly painful.

The copper proportion in it conjointly helps in reducing the symptoms of arthritis.Protects vascular system: It is made in organic process worth, particularly throughout the summer, once it delivers unnumbered benefits to the body. The food ranking systems in zucchini-rich countries have declared that this squash has extensive levels of metal and ascorbic acid that facilitate to stay the center robust.

During the analysis, most of those nutrients were found effective within the bar of diabetic cardiovascular disease and induration of the arteries. The metallic element content notably reduces the danger of heart attacks and strokes. together with K, metallic element conjointly helps in reducing high force per unit area.

The ascorbic acid and carotenoid found in summer squash facilitate in preventing the oxidization of cholesterin. change cholesterin builds au courant vas walls, however these nutrients cut back the event of induration of the arteries. The nourishment B-complex vitamin is needed by the body to eliminate associate unsafe metabolic byproduct known as homocysteine, which may lead to attack and stroke if the degree rise too high.

Its fiber content lowers high cholesterin levels additionally, thereby serving to to scale back the danger of induration of the arteries and heart diseases thanks to polygenic disease.

Immunity

Our body USually|is often} actively engaged within the defense against several microorganisms that may hurt us. At times, this process gets weak, and would possibly want reinforcements. feeding foods made in antioxidants like ascorbic acid will strengthen our system, and obtain it up and dealing like ne’er before.

Zucchini is one food that may give you with vital doses of this nourishment.Vitamin C acts to spice up immunity by stimulating the assembly of white blood cells. These cells square measure concerned in protective our system against invasive harmful microorganisms like viruses and microorganism. ascorbic acid conjointly helps fight the activities of free radicals, whose interaction with different body cells might lead to neoplasm growth.

Zucchini’s Benefits

• Zucchini belongs to the Cucurbita pepo species that was the topic of associate India-based study. because it seems, this species of summer squash protects against the event of lesion of the abdomen and also the small intestine, that is that the section of the little viscus that connects it to the abdomen. within the study, same ulcers were elicited in laboratory rats by giving them Empirin. once fourteen days of administering the extract of ripe Cucurbita pepo, membrane thickening of the abdomen and duodemun was determined, confirming the gastroduodenum-protective and overall anti-ulcerogenic mechanism of Cucurbita pepo.
• Squash has conjointly been found to contain measurable amounts of cellulose, a sort of sugar that shows potential for dietary medical aid for polygenic disease. The dicot genus species of squash, of that zucchini belongs to, has been studied in Slovak Republic, and it’s been found that the cellulose during this species of squash has medicinal drug effects. within the study, coughing was elicited in guinea pigs by administering acid. Afterwards, cellulose polysaccharides got orally to the themes and their coughing reflex remittent. The results were then compared to the medicinal drug effects of pain pill, a sort of narcotic, and cellulose polysaccharides had comparable, and in some cases even higher cough-suppressing activity than pain pill.
• Phytonutrients square measure extensive in zucchini additionally and continuing analysis has brought forth discovery of assorted phytochemicals gift in Cucurbita pepo. These compounds have shown multi-targeted bar of cancer by scavenging and killing free radicals and preventing chronic inflammation additionally.Zucchini’s Risks:
• Zucchini has oxalates, compounds that naturally occur in our body and that tend to crystallize once in excess amounts. people with impaired urinary organ and vesica functions should initial visit their doctors before incorporating zucchini in their diet to avoid exasperating their several medical conditions.
• Zucchini is one in all the fifty fruits and vegetables with dreadful levels of insecticide residue additionally, this per the Environmental social unit. Minimizing exposure to petrochemicals is crucial as it’s been shown to create birth defects and varied sicknesses like cancer.

Cultivation

• Sow seeds in pots
• Seed may be seeded in pots from March to the top of might. Fill a 7.5cm (3in) pot with compost and firm gently.
• Sow a seed vertically two.5cm (1in) deep and canopy. Label, water and place in an exceedingly propagator or on a sill.
• When roots begin to point out through very cheap of the pot, place into a twelve.5cm (5in) instrumentality. Plant out into growing baggage, soil or an outsized pot in late spring or early summer.Sow seeds in soil
• Seed may be seeded directly into the soil from late-May to early summer.
• Choose a sunny, secure spot and improve the soil by dig in some well-rotted manure or compost.
• Sow 2 seeds on their aspect two.5cm (1in) deep and once the seedlings have germinated, remove the weakest one.Aftercare
• Plenty of water is important, particularly once the plants square measure in flower and so once the fruits have began to swell. Mulch to lock in wet.
• If you dig in lots of manure before planting, further feeding is senseless on significant, fertile soil.
• On sandy or lightweight soil, regular drenches with a liquid feed can facilitate boost production.Harvesting and storage
• To keep plants productive you would like to reap courgettes regarding thrice every week at the peak of the season.
• The correct size to choose depends on selection, however as a rule, harvest courgettes once they are 10cm (4in).
• Use a pointy knife to sever the fruit from the plant. Courgettes square measure best eaten recent or may be keep for a number of days within the refrigerator.
• Squashes square measure a lot of variable in form and size, thus browse the seed packet for gathering and storage info.
• Marrows square measure typically thought of to be courgettes adult giant, and need constant growing conditions.
• When growing marrows, harvest frequently once they are 20cm (8in) long, or leave them to mature for winter use.
• Marrows may be keep for a protracted amount of your time if unbroken at a temperature between seven.5C to 10C (45F to 50F).

What are some characteristics of living things?

No single characteristic is enough to describe a living thing. Some nonliving things share one or more traits with living things. Living things share the following characteristics: made up of units called cells reproduce based on a universal genetic code grow and develop obtain and use materials and energy respond to their environment maintain a stable internal environment change over time

Characteristics of Living Things

• Living things are made up of cells. A cell is the smallest unit of an organism that can be considered alive.
• Living things reproduce.  In sexual reproduction, cells from two different parents unite to form the first cell of the new organism. In asexual reproduction, a single parent produces offspring that are identical to itself.
• Living things grow and develop. During an organism’s development, cells differentiate, which means that the cells look different from one another and perform different functions.
• Living things are based on a universal genetic code. Organisms store the information they need to live, grow, and reproduce in a genetic code in a molecule called DNA.
• Living things obtain materials and use energy. The combination of chemical reactions through which an organism builds up or breaks down materials is called metabolism.
• Living things respond to their environment. A stimulus is a signal to which an organism responds.
• Living things maintain a stable internal environment. Although conditions outside an organism may change, conditions inside an organism tend to remain constant. This process is called homeostasis.

Taken as a group, livings things change over time. Over many generations, groups of organisms typically evolve. Big Ideas in Biology Science as a Way of Knowing Science is not just a list of “facts. ” The job of science is to use observations, questions, and experiments to explain the natural world.

Interdependence in Nature

All forms of life on Earth are connected together into a biosphere, which literally means “living planet. The relationship between organisms and their environment depends on both the flow of energy and the cycling of matter. Matter and Energy Life’s most basic requirements are matter that serves as nutrients to build body structure and energy to fuel the processes of life.

Cellular Basis of Life

Organisms are composed of one or more cells, which are the smallest units that can be considered fully alive. Information and Heredity Life’s processes are directed by information carried in a genetic code that is common, with minor variations, to every organism on Earth.

That information, carried in DNA, is copied and passed from parents to offspring. Unity and Diversity of Life All living things are fundamentally alike at the molecular level, even though life takes an almost unbelievable variety of forms Evolution In biology, evolution, or the change in living things through time, explains inherited similarities as well as the diversity of life. Structure and Function Structures evolve in ways that make particular functions possible, allowing organisms to adapt to a wide range of environments.

Homeostasis

An organism’s ability to maintain a relatively stable internal environment in the face of changing external conditions is vital to its survival. Science, Technology, and Society Science seeks to provide useful information, but only a public that truly understands science and how it works can determine how that information should be applied. Branches of Biology There a many branches of biology. For example: Zoologists study animals. Botanists study plants. Paleontologists study ancient life. The job of science is to use observations, questions, and How can life be tudied at different levels?

Tissues, organs, and organ systems Cells Smallest functional unit of life Molecules Groups of atoms; smallest unit of most chemical compounds At all these levels, smaller living systems are found within larger systems. More than any other area of study, biology touches your life every day. Biology provides information about the food you need and the methods for sustaining the world’s food supplies. Biology describes the conditions of good health and the behaviors and diseases that can harm you. Biology is used to diagnose and treat medical problems.

Biology identifies environmental factors that might threaten you. Biology in Everyday Life Biology helps you understand what effects the quality of your life. Biology provides decision makers with useful information and analytical skills needed to predict and effect the future of the planet.

Type-B PDLs are particularly common in pregnant women among various forms of PDLs classified since Matzumoto first described PDL in 1913 (3). Initially, PDL was classified into four types A to D by Miura (7) and twenty-four years later another class E was added by Selmanowitz et al. (4) Facial PDL has also been well documented and were classified into F, G, and H among the Indian population (8,9). Type-B PDL can coexist with type-A in a few number of patients (10).

It can also occur in the absence of pregnant (2,4). In this cross-sectional study of 220 primigravidae and 220 controls, the age group ranges between 18 to 40 years for both cases and controls. The mean age of the cases and controls were respectively 27.61 ± 3.928 (SD) and 26.83 ± 4.069 (SD). The highest proportion of participants, more than 75%, recruited for the study belong to the age less than 30 years.

The pattern of age distribution in this study is similar to that reported by Kumar et al (11) and Rathore et al (12) in their study of cutaneous changes in pregnancy. This may reflect higher pregnancy rate among the younger age population possibly due to higher fertility rate in this age group. Pigmentary changes in pregnancy is the commonest physiological cutaneous changes witness by pregnant women (13). As many as over 90% in some studies developed one form of pigmentary changes or the other with lots of cosmetic concerns to the patients (13).

However, the prevalence of pigmentary demarcation lines (PDL) are low in this studies (11,13)The prevalence of pigmentary demarcation lines in this study varies with increasing gestational age. Type-A PDL was not observed among the pregnant women studied but was noticed in 0.5 percent of the controls group. The proportion of patients with type-B PDL in second trimester was 1.8%, this figure was however doubled 3.6% by third trimesters suggesting the fact that PDL tend to occur more as pregnancy advances attributable to neurogenic inflammation from compression of peripheral nerves S1 and S2 by enlarging uterus (14).

This result is similar to 2% earlier reported by Kumar et al (11). However, other researchers have documented lower prevalence than our study. Rathore et al (12) reported 0.25%, Kumari et al (13) 0.3% and Singh et al (6) 0.32% among pregnant population. The higher prevalence observed in this study compare to these previous studies may be due to the fact that our patients were followed up to the third trimester, some of which could have been missed in earlier trimesters without follow up.

Besides, type-b PDL are observed to develop more in later part of pregnancy probably as a result of increasing pregnancy hormones. Other possible reasons for discrepancies is the skin phototypes and racial differences of the studied populations as it has been observed to be commoner among Negroes (4). Type-B can also co-exist with type-A PDL although this is an infrequent phenomenon (15). This pattern was evident in this study as one patient had type A and B PDL together for the first time throughout her pregnancy and another one only develop type B co-existing with type-A only in third trimester.

This pattern is similar to the findings by Nakama et al (16) and Arunachalam et al (17). The pathogenesis of type B pigmentary demarcation lines is largely unknown (18). The influence of pregnancy hormones such as beta-melanocyte-stimulating hormone, eostrogen and progesterone has been suggested as one of the possible explanations for the development of pigmentary demarcation lines (19,20). The hormonal theory appeared plausible when the cases in our study are compare with the controls, this was however challenge by the fact that type-B PDL has been reported in amenorrhiec Chinese woman with low estradiol (2)

This should further prompt more research to unravel the pathogenesis of PDL.Other types of pigmentary demarcation lines C, D, E and facial PDL F, G, H were not observed in this study. This may probably be due to the fact that skin of negroid pregnant woman present with darker generalized hyperpigmentation that make this types of PDL difficult to discern. Other possible explanations is the close resemblance of facial PDL to melasma, exogenous onchronosis, periorbital hyperpigmentation and post inflammatory hyperpigmentation, naevus of Ota or Ito (9,21,22).

The pathogenesis of PDL remains controversial with many theories been propounded to explain the enigma. Even though PDL is well classified and accepted, there is no consensus yet on the pathogenesis, possibly multiple mechanism are interacting together to explain the aetiology of PDL. Among these theories are:Familiar clustering – genetic and racial predisposition play a role in the development of PDL as it has been reported to occur among family members and relatives in up to 22.2% of cases (23). Although PDL occurs in all races and skin types it is however commoner among the blacks than Caucasians (24).

It is postulated that PDL is dominantly inherited (9). However, none of our patients could give family history of PDL.Atavistic remnant phenomenon- this is an evolutionary throwback in which there is reappearance of a primitive characteristic. This characteristic is an adaptive mechanism in which the more pigmented dorsal surface protects against the effect of ultraviolet radiations and for temperature regulation (9,25).Pigmentary mosaicism- mosaicism occurs when two or more genetically distinct population of cells occur side by side in an individual (26). This is a consequence of structural or functional genetic mutation (27).

A classic pattern of cutaneous mosaicism is depicted by lines of Blaschko which has been described in many pigmentary disorders. Krivo proposed cutaneous mosaicism as the possible aetiology of type-b PDL (28). Mosaicism has also been ascribed to familiar clustering and preponderance in females with facial PDL (9).Axial-neural theory- Maleville et al (29) in an attempt to explain this enigma opined that the pathogenesis of PDL is better explained by virtual axial lines of Sherrington described by Miura (7) other than the clonal-Blaschko theory proposed by Krivo (28).

Blaschko lines correspond to distribution of linear nevoid conditions, or dermatomal lines.(30,31) The axial lines of Sherrington coincide with subsets of Voigt’s line and cutaneous nerve distributions that divide dermatomes when noncontiguous dorsal root give rise to two contiguous dermatome (7,29). Additionally, melanogenesis are under neural control, and nerve endings may be different in their sensitivity to neural stimulation resulting in dual population of melanocyte with subtle variation in pigmentation in-between dermatomes given rise to PDL (6).

Mutations are various forms of changes in ones DNA’s structure or makeup. This abnormality can happen for various reasons such as chemical misuse, harmful viruses or environment factors. When a mutation occurs in ones genetic structure, there is often a push to find out what went wrong and if it was a onetime occurrence or a genetic abnormality that no one in the family knew about until the recent discovery. This genetic abnormality occurs when there is a dominant gene which comes from a parent.

This dominant gene attaches itself to a recessive gene and sparks a change in the genetic sequence of the offspring. This is most relevant as I was observing my nephew last weekend. My brother is “dark skinned”, tall and slim. My sister-in law is of French decent and full bodied while looking at my nephew, I ascertained that he is heading towards his mother’s side of the family he has the “fair skin, “finer grain of hair”, and the full body of his mother, thus his physical appearance is a mixture of both his mother’s and father’s genes along with a mutation of their DNA.

Sexual Reproduction ensures life will continue no matter what happens. As genes are exchanged between two potential parents, the resulting offspring ends up with a combination of genes from both parents which then in turn gives them their own genetic makeup. This can lead to an expansion in various parts of the world where there is a diverse genetic makeup of people. This is due to various factors such as economics, upward mobility and educational opportunities.

When this occurs new communities develop, form and branch out spawning a growth in population and migration. As the various traits from one’s genetic makeup mixes with others of another makeup, this helps to further expand the world’s unique makeup among its various populations and cultures. As these factors come into play over and over again, this helps to ensure the possibility of cloning one’s self or someone else will never happen.

This also ensures the population will continue to grow change and the diversity of it all helps to make the world we live in today all the more unique and complicated. As I reflect on my nephew’s own unique genetic makeup, I can’t help but wonder what his future will hold in regards to his own children, where he will migrate to and what he will contribute to leave his mark on the world. One can only hope that the traits and genes he has inherited from his mother and father will help him to reach his full potential.