6 - Genetic drift & inbreeding Agents of evolution o...

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Agents of evolution o mutation o natural selection o genetic drift o migration (gene flow) • Effective population size, N e • Factors affecting N e Mating system Fluctuations in population size Inbreeding Inbreeding depression Consequences of small population size
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Genetic drift = random change in allele frequencies from one generation to the next due to chance differences in survival and reproduction in a finite population
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Genetic drift leads to the random loss or fixation of alleles Small population (2N = 18) Large population (2N = 100) allele frequency generation
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Genetic drift Events that generate small population size Founder events Population bottlenecks
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Genetic drift example: population bottleneck
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Genetic drift example: population bottleneck
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Genetic drift example: founder event
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Genetic drift Population subdivision = large population splits into small populations
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6 - Genetic drift & inbreeding Agents of evolution o...

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