5 - BIOLOGY LECTURE NOTES (1/14/09) Genetic Drift,...

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BIOLOGY LECTURE NOTES (1/14/09) Genetic Drift, Mutation, Migration, and Inbreeding Hardy-Weinberg (H-W) allows calculation of genotype frequencies from gene frequencies assuming random mating o Conservation of variance principle o Can test existing data for fit to H-W to test for selection Patterns of natural selection o Heterozygote advantage o Directional selection For example, directional selection caused average body size to increase in a cliff swallow population. o stabilizing selection the pattern of natural selection called stabilizing selection occurs when individuals with intermediate traits reproduce more than others, thereby maintaining intermediate phenotypes reduces amount of variation in a trait ex: for example, very small and very large babies are the most likely to die, leaving a narrower distributaries of birth weights o o disruptive selection in contrast to stabilizing selection, the pattern of natural selection called disruptive selection
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5 - BIOLOGY LECTURE NOTES (1/14/09) Genetic Drift,...

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