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genetic drift

noun
1.
random changes in the frequency of alleles in a gene pool, usually of small populations.
Compare gene flow.
Origin
1955-1960
1955-60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for genetic drift
  • The culprit is environmental change, not genetic drift in the rice seed itself.
  • Whereas natural selection tends to weed out harmful mutations in genes and their related proteins, genetic drift does not.
  • Each group or groups would feel selective pressures in different ways and genetic drift would occur differently with each group.
  • In smaller groups, random genetic drift may determine the fate of genes.
  • Random genetic drift is affected by population size and structure.
  • The connection with inter-population differences is fairly clear with genetic drift theory.
  • First, let's dismiss the possibility of random genetic drift and therefore a bottleneck.
  • As effective population size declines the power of random genetic drift becomes more evident.
  • Otherwise, in only a few generations, genetic drift begins to get out of hand.
  • genetic drift results in the extinction of many lineages, and the stochastic rise in frequency of a few lineages.
genetic drift in Medicine

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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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genetic drift in Science
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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genetic drift in Culture

genetic drift definition


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.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source

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