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genetic drift
(redirected from Random genetic drift)

    Also found in: Medical, Wikipedia 0.06 sec.
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 drift

Change 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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Oregon strains could represent an independent population; alternatively, they may have evolved from the VGIIa or VGIIb strains previously described in BC or from VGIIa strains from California (6,9,16), either through random genetic drift or through sexual recombination.
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21) Compared to Darwinism the modern synthesis gives more emphasis to random genetic drift than to natural selection.
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