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genetic drift |
Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson | 0.51 sec. |
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genetic drift: see genetics genome, or characteristic set of genes, that contains the total genetic information for an individual organism. In many familiar organisms two genes for each trait are present in each individual, and these paired genes, both governing the same trait, are called alleles. ..... Click the link for more information. . genetic driftChange in the pool of genes of a small population that takes place strictly by chance. Genetic drift can result in genetic traits being lost from a population or becoming widespread in a population without respect to the survival or reproductive value of the gene pairs (alleles) involved. A random statistical effect, genetic drift can occur only in small, isolated populations in which the gene pool is small enough that chance events can change its makeup substantially. In larger populations, any specific allele is carried by so many individuals that it is almost certain to be transmitted by some of them unless it is biologically unfavourable. |
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Although selection and/or other factors cannot be totally excluded, the observed reduction in diversity is likely the result of genetic drift exacerbated by declines in [N. Complicating problems of origin, all of the pandemic and epidemic influenza A viruses that have appeared since 1918 have been descendants of it, arising by either genetic drift, reassortment with prevalent avian viruses, or in 1 case (1977) by apparent release from a freezer. Companies in this sector now must wrestle with legitimate public concerns about biotech, food crop contamination, species diversity, genetic drift and environmental impact. |
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genetic drift
