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Unformatted text preview: POPU LAT ION GENET ICS: M UTAT ION, DR I FT & M IGRAT ION LIFE 22.2, 22.4-22.4.1 | KLUG 629-634 22.2 What are the mechanisms of evolutionary change?-evolutionary mechanisms are forces that change the genetic structure of a population . H- W equilibrium is a null hypothesis that assumes that those forces are absent. -evolutionary mechanisms include mutation , gene flow , genetic drift , nonrandom mating , and natural selection 22.2.1 Mutations generate genetic variation-One condition for HardyWeinberg equilibrium is that there be no mutation . Although this condition is never strictly met, the rate at which mutations arise at a single locus is usually so low that mutations by themselves result in only very small deviations from Hardy Weinberg equilibrium 22.2.2 Gene flow may change allele frequencies-few populations are completely isolated from other populations of the same species ....
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