Lec 18 - BIS2B Fall 2009 (Keen) Lecture 18 . More on...

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Unformatted text preview: BIS2B Fall 2009 (Keen) Lecture 18 . More on Population Genetics 26 October Violations of the assumptions of HW equilibrium (today’s assumptions are no mutation, no migration, no advantage to particular alleles, plus examples) Students should be able to: predict the effects of some violations on genotypic frequencies. predict the effects of natural selection on discrete and quantitative trait distributions in future generations, with special reference to the mean and variance of quantitative trait distributions. Selection = directional, stabilizing, divergent… Which violations could cause this? In diploid organisms, gene/allelic frequencies & genotypic ratios in large biparental populations reach an equilibrium in 1 generation, and remain constant thereafter, when … 1. large population size (no genetic drift) 2. no migration (gene flow from other populations 3. no mutations 4. random mating 5. no advantages to alleles (natural selection) SO: what about small population size and genetic drift, gene flow, mutations, non- random mating and natural selection? What effect will they have? What are the violations of the 5 Hardy- Weinberg conditions for no evolution?...
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This note was uploaded on 04/21/2010 for the course BIS 2C BIS 2C taught by Professor Rizzo during the Winter '09 term at UC Davis.

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Lec 18 - BIS2B Fall 2009 (Keen) Lecture 18 . More on...

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