Biology / Bio 1759 · Atom · ~20 seconds
The Founder Effect
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The founder effect occurs when a small group splitting off, by chance, does not reflect the larger population's allele frequencies, and descendants inherit the skew.
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A small colonizing group with a high proportion of one allele can found a population where that allele stays unusually common.
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The founder effect is a form of drift specific to a founding moment, not selection.