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Lecture 6: Measuring Genetic Diversity

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Genetic Variation Definition, Causes, and Examples

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Published on Jan 26, What is genetic diversity? What is a gene? How is genetic diversity measured? Types of genetic variation, Evolutionary processes, Loss of genetic Variation, etc. SlideShare Explore Search You. Submit Search. Home Explore. Successfully reported this slideshow. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime. Genetic diversity lecture notes. Upcoming SlideShare.

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genetic variation ppt

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Products Sold on our sister site CrystalGraphics. Title: Genetic Variation. How mutation and sexual reproduction each produce genetic variation Variation Variations exist between Tags: baby genetic variation. Latest Highest Rated. How mutation and sexual reproduction each produce genetic variation 3 Variation Variations exist between individuals in a given population. The following are heritable Mutation mostly point mutations other mutations are possible Sexual Reproduction crossing over, independent assortment Diploidy recessive alleles can be hidden from natural selection but stay around 4 Variation Outbreeding mating with non-related partners increases new allele combinations Behavioral incest is blocked in most higher order species Balanced polymorphism different phenotypes in a single population propagate natural selection Heterozygous advantage advantage to heterozygous alleles despite deadly recessive alleles ex.

Suppose a population or organisms with gene loci is fixed at half of these loci. How many alleles are found in its gene pool? Which parts of the Hardy-Weinberg equation p2 2pq q2 1 correspond to the frequency of individuals that have at least one PKU allele?

How does sexual recombination produce variation? Distinguish genetic drift and gene flow in terms of a how they occur and b their implications for future genetic variation in a population. Why or why not? What is the relative fitness of a sterile mule? How does sexual selection lead to sexual dimorphism? Explain what is meant by the reproductive handicap of sex. Whether your application is business, how-to, education, medicine, school, church, sales, marketing, online training or just for fun, PowerShow.

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Genetic Variation - PowerPoint PPT Presentation

Check out PowerShow. There is truly something for everyone! Related More from user.After you enable Flash, refresh this page and the presentation should play. Get the plugin now. Toggle navigation. Help Preferences Sign up Log in. To view this presentation, you'll need to allow Flash. Click to allow Flash After you enable Flash, refresh this page and the presentation should play. View by Category Toggle navigation. Products Sold on our sister site CrystalGraphics. Title: Mutation and Genetic Variation.

Description: chromosome during meiosis.

genetic variation ppt

Mistakes during meiosis can result in unequal crossing over, in which Tags: genetic meiosis mutation variation. Latest Highest Rated. Title: Mutation and Genetic Variation 1 Mutation and Genetic Variation For every gene, there are many different alleles - alleles are versions of the same gene that differ in their DNA base sequence - some alleles differ in the protein product of the gene others do not more on this to follow - your combination of alleles is unique, and makes you you Alleles are generated by mutations, which are changes in the DNA base sequence 2 Evolution and Alleles Define evolution genetic change in a population over time But what does genetic change mean, exactly?

Mutation can create new alleles that were not previously present in that population 2.

genetic variation ppt

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genetic variation ppt

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Mutation and Genetic Variation - PowerPoint PPT Presentation

Most of the presentations and slideshows on PowerShow. You can choose whether to allow people to download your original PowerPoint presentations and photo slideshows for a fee or free or not at all. Check out PowerShow. There is truly something for everyone! Related More from user.G enetic variation can be defined as the genetic makeup of organisms within a population change. Genes are inherited segments of DNA that contain codes for the production of proteins.

Genes exists in alternate versions, or alleles that determine distinct traits that can be passed on from parents to offspring. Genetic variation is important to the processes of natural selection and biological evolution. The genetic variations that arise in a population happen by chance, but the process of natural selection does not.

Natural selection is the result of the interactions between genetic variations in a population and the environment. The environment determines which genetic variations are more favorable or better suited for survival. As organisms with these environmentally selected genes survive and reproduce, more favorable traits are passed on to the population as a whole.

Genetic variation occurs mainly through DNA mutationgene flow movement of genes from one population to anotherand sexual reproduction. Due to the fact that environments are unstable, populations that are genetically variable will be able to adapt to changing situations better than those that do not contain genetic variation.

Favorable genetic traits in a population are determined by the environment. Organisms that are better able to adapt to their environment survive to pass on their genes and favorable traits. Sexual selection is commonly seen in nature as animals tend to select mates that have traits that are favorable. As females mate more often with males considered to have more favorable traits, these genes occur more often in a population over time. A person's skin colorhair color, dimples, freckles, and blood type are all examples of genetic variations that can occur in a human population.

Examples of genetic variation in plants include the modified leaves of carnivorous plants and the development of flowers that resemble insects to lure plant pollinators. Gene variation in plants often occurs as the result of gene flow.

Pollen is dispersed from one area to another by the wind or by pollinators over great distances. Examples of genetic variation in animals include albinism, cheetahs with stripes, snakes that flyanimals that play deadand animals that mimic leaves.

These variations enable the animals to better adapt to conditions in their environments. Share Flipboard Email. Regina Bailey. Biology Expert. Regina Bailey is a board-certified registered nurse, science writer and educator. Updated August 21, Key Takeaways: Genetic Variation Genetic variation refers to differences in the genetic makeup of individuals in a population.

Genetic variation is necessary in natural selection. In natural selection, organisms with environmentally selected traits are better able to adapt to the environment and pass on their genes. Major causes of variation include mutations, gene flow, and sexual reproduction. DNA mutation causes genetic variation by altering the genes of individuals in a population. Gene flow leads to genetic variation as new individuals with different gene combinations migrate into a population.

Sexual reproduction promotes variable gene combinations in a population leading to genetic variation.

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