from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Random fluctuations in the frequency of the appearance of a gene in a small isolated population, presumably owing to chance rather than natural selection.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An overall shift of allele distribution in an isolated population, due to random fluctuations in the frequencies of individual alleles of the genes.


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