Genetic drift
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Genetic drift is the change in the frequency of an existing allele in a population due to chance.
The Effects of Genetic Drift on Different Population Sizes
Changes in a population's allele frequency following a population bottleneck: the rapid and radical decline in population size has reduced the population's genetic variation.
When very few members of a population migrate to form a separate new population, the founder effect occurs. For a period after the foundation, the small population experiences intensive drift. In the figure this results in fixation of the red allele.
Darwin's finches by Gould
Allele
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An allele is a variant of the sequence of nucleotides at a particular location, or locus, on a DNA molecule.
Genetic drift
…Genetic drift is the change in the frequency of an existing allele in a population due to chance. Genetic drift may cause alleles to disappear completely and thereby reduce genetic variation. It can also cause initially…
Blue eye 2
Boje oka
Human eye with limbal ring, anterior view
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