BIOLOGY 3UU3 Chapter Notes - Chapter 7: Silene Vulgaris, Genetic Drift, Allele Frequency
19 Apr 2013
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Chapter 7: mendelian genetics in populations ii: migration, genetic drift, and. Nonrandom mating (pages 223 228, 232 242 and 264 276) Adding migration to the hardy-weinberg analysis: migration as a mechanism of. Can migration from the continent to the island upset the hardy- Assume the frequency of a1 on the island is 1. 0. Hardy-weinberg equilibrium out of balance on the island: migration of individuals from the mainland to islands appears to be preventing the divergence of island versus mainland populations of lake erie water snakes. The low diversity among intermediate populations probably reflects the homogenizing influence of gene flow: the higher diversity of young and old populations probably represents genetic drift. Genetic drift: this mechanism is absolutely random, genetic drift does not lead to adaptation, but it does lead to changes in allele frequencies. In the hardy-weinberg model, genetic drift results from violation of the assumption of infinite populations.
