The founder effect differs from a population bottleneck in that the founder effect involves the isolation of a small colony of individuals from a larger population.
The bottleneck effect is when there is a very noticeable reduction in population size for a minimum of one generation time. A founder effect is when a few individuals move to a new region and start a colony of limited genetic variation.
Both are examples of genetic drift. A large portion of a genome is wiped out in bottleneck effect, whereas a larger population migrate to establish their own population in the founder effect.
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