| 单词 | genetic drift |
| 释义 | genetic drift noun[U] biologyspecializeduk/dʒəˌnet.ɪk ˈdrɪft/us/dʒəˌnet̬.ɪk ˈdrɪft/asituationin which thefrequencyof aparticulargenein asmallpopulationoflivingthingschangeswithout aknowncause 基因漂变，遗传漂变Genetics
genetic drift| American Dictionarygenetic drift noun[U] biology asituationin which thenumberof aparticulargenein asmallpopulationoflivingthingschangeswithout aknowncause Examplesofgenetic driftgenetic drift Given enough time,geneticdriftresults in the fixation or loss of alleles at particular loci. From theCambridge English Corpus These data suggest that purifying selection removes deletion variation before it is fixed in populations, but that insertions are capable of fixing throughgeneticdrift. From theCambridge English Corpus Molecular markers to studygeneticdriftand selection in wheat populations. From theCambridge English Corpus This is becausegeneticdriftdrives deleterious mutants to high frequencies for all mating systems. From theCambridge English Corpus Thus, each year the worms were subjected to selection pressure during 2 steps, and togeneticdriftduring 22 steps. From theCambridge English Corpus When populations are small, effects ofgeneticdriftare more important. From theCambridge English Corpus The interaction between selection against partially recessive mutations andgeneticdriftin small populations also influences the rate of decay of neutral variation. From theCambridge English Corpus The biology of the crop would suggest that in its natural habitat, 'populations' could evolve bygeneticdriftinto isolation, inlocalities such as river valleys. From theCambridge English Corpus Two forces affect the inbreeding andgeneticdriftat neutral loci linked to loci under selection. From theCambridge English Corpus The forces that cause differentiation for these markers would be the result of mutation,geneticdriftand no selection. From theCambridge English Corpus On the other hand, parasites from such host populations may also be less variable, because they themselves experiencegeneticdrift, and therefore less virulent. From theCambridge English Corpus During the establishment of these populations, bottlenecks and the effects ofgeneticdriftmay result in unrepresentative genotypic distributions and loss of variation. From theCambridge English Corpus There can be no doubt that evolutionary potential is reduced bygeneticdriftand inbreeding in small populations. From theCambridge English Corpus The process of differentiation of the frequencies of non-selected ancestral alleles in different taxonomic groups due togeneticdriftbegins immediately after a speciation event. From theCambridge English Corpus Given that distance estimators based on allele frequencies rely ongeneticdrift, they are sensitive to changes in population size. From theCambridge English Corpus 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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