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Genetic Drift LIFS 691 Advanced Evolution. Genetic Drift Random changes in allelic frequencies arising from stochastic processes in populations of finite.

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Presentation on theme: "Genetic Drift LIFS 691 Advanced Evolution. Genetic Drift Random changes in allelic frequencies arising from stochastic processes in populations of finite."— Presentation transcript:

1 Genetic Drift LIFS 691 Advanced Evolution

2 Genetic Drift Random changes in allelic frequencies arising from stochastic processes 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) Large Populations N = 50 (per population) Generation Allelic Frequency (p) Hartl & Clark (1989), Principles of Population Genetics

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

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