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Genetic Drift

Genetic Drift. LIFS 691 Advanced Evolution. Genetic Drift. Random changes in allelic frequencies arising from stochastic processes in populations of finite size. Causes of Genetic Drift. independent assortment of alleles random variation in survival random variation in mating success

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Genetic Drift

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  1. Genetic Drift LIFS 691 Advanced Evolution

  2. Genetic Drift Random changes in allelic frequencies arising from stochasticprocesses in populations of finite size.

  3. Causes of Genetic Drift • independent assortment of alleles • random variation in survival • random variation in mating success • random variation in fecundity

  4. Computer Simulations of Genetic Drift Small Populations N = 9 (per population) Allelic Frequency (p) Large Populations N = 50 (per population) Hartl & Clark (1989), Principles of Population Genetics Generation

  5. Experimental Studies of Genetic Drift Locus controlling color (2 alleles) in flour beetles (Tribolium spp.) N = 10 (per population) Allelic Frequency (p) N = 100 Generation Rich et al. (1979), Evolution 33: 579-584

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