| 词汇 | genetic-drift |
| 释义 | genetic drift noun[ U ] biology specializeduk /dʒəˌnet.ɪk ˈdrɪft/ us /dʒəˌnet̬.ɪk ˈdrɪft/ a situation in which the frequency of a particular gene in a small population of living things changes without a known cause基因漂变，遗传漂变 Genetics accession number adenine anaphase autosomal autosomally genetic fingerprinting genetically engineered geneticist genic genomic genomics genotypic monozygotic mutate non-familial non-genetic non-mutant nondominant nonhomologous sex-linked genetic drift | American Dictionarygenetic drift noun[ U ] biology a situation in which the number of a particular gene in a small population of living things changes without a known cause Examples of genetic driftgenetic drift Given enough time, geneticdrift results in the fixation or loss of alleles at particular loci. These data suggest that purifying selection removes deletion variation before it is fixed in populations, but that insertions are capable of fixing through geneticdrift. Molecular markers to study geneticdrift and selection in wheat populations. This is because geneticdrift drives deleterious mutants to high frequencies for all mating systems. Thus, each year the worms were subjected to selection pressure during 2 steps, and to geneticdrift during 22 steps. When populations are small, effects of geneticdrift are more important. The interaction between selection against partially recessive mutations and geneticdrift in small populations also influences the rate of decay of neutral variation. The biology of the crop would suggest that in its natural habitat, 'populations' could evolve by geneticdrift into isolation, inlocalities such as river valleys. Two forces affect the inbreeding and geneticdrift at neutral loci linked to loci under selection. The forces that cause differentiation for these markers would be the result of mutation, geneticdrift and no selection. On the other hand, parasites from such host populations may also be less variable, because they themselves experience geneticdrift, and therefore less virulent. During the establishment of these populations, bottlenecks and the effects of geneticdrift may result in unrepresentative genotypic distributions and loss of variation. There can be no doubt that evolutionary potential is reduced by geneticdrift and inbreeding in small populations. The process of differentiation of the frequencies of non-selected ancestral alleles in different taxonomic groups due to geneticdrift begins immediately after a speciation event. Given that distance estimators based on allele frequencies rely on geneticdrift, they are sensitive to changes in population size. See all examples of genetic drift These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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