12-05-17 Exam 4 Notes.docx - Chapter 19 Genetic Variation...

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Chapter 19 Genetic Variation: differences in alleles of genes found within individuals in a population; raw material for natural selection Evolution: how an entity changes through time; development of modern concept traced to Darwin Darwin was not the first to propose a theory of evolution; however he propose natural selection as the mechanism of evolution Population Genetics: study of properties of genes in a population; evolution results in a change in the genetic comp of a population; is raw material for selection; nature, genetic variation is the rule Human populations contain substantial amounts of genetic variation; genes that influence blood groups; genes that influence enzymes (Enzyme Polymorphisms) Polymorphic Variation: more than one allele at frequencies greater than mutation alone SNPs: DNA polymorphism; used to assess patters in human and natural populations Hardy-Weinberg Principle: changes allele frequency; equilibrium – Proportions of genotypes do not change in a

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