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| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
genetic drift 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. Also called drift.
| genetic drift
Fluctuations in the frequency of a gene in a small isolated population, thought to be due to random chance rather than natural selection. |
A term that describes the random fluctuations in a gene pool over time. In large populations, the effects of genetic drift are negligible. (Compare natural selection.)