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Lecture12_MigrationInbreeding

Lecture12_MigrationInbreeding - Gene flow and non-random...

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Gene flow and non-random mating I. Gene flow (migration) as an evolutionary force A. Theory: the one-island model One-way movement of individuals (and alleles) from a large population on a continent to a Suppose that allele A 1 is at frequency on the island and that there are breeding individuals Suppose that allele A 2 is at frequency on the continent If individuals move from the continent to the island and begin to breed, the frequencies of the alleles in the island population are now: freq ( A 1 ): freq ( A 2 ): Upshot: B. What are the evolutionary consequences of gene flow? 1. Gene flow reduces differences between populations 2. May introduce new alleles; these may be II. Inbreeding as a form of non-random mating Inbreeding = mating among relatives A. When does inbreeding occur? 1. plant: 2. humans: 3. small populations B. What is the effect of inbreeding? Increases homozygosity =
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A 1 A 1 A 1 A 2 A 2 A 2 NOTE: inbreeding does not change Therefore, inbreeding does not C. What is inbreeding depression?
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