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Genetic Drift

Genetic Drift. Unexpected random changes in gene frequency that occur because of small population size. Two mechanisms: Population Bottleneck A large portion of the population is wiped out, leaving behind a very small population (ex. Natural disaster) 2) Founder Effect

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Genetic Drift

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  1. Genetic Drift Unexpected random changes in gene frequency that occur because of small population size

  2. Two mechanisms: • Population Bottleneck A large portion of the population is wiped out, leaving behind a very small population (ex. Natural disaster) 2) Founder Effect A small portion of the population breaks away from the parent population and becomes isolated from it

  3. Video Clip – How Evolution Works pt 2 • http://www.youtube.com/watch?v=RtIQvkQWTZY • (start at 3:38 – about 5 minutes long)

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