Although many studies confirm long-term small isolated populations (e.g. island endemics) commonly sustain low neutral genetic variation as a result of genetic drift, it is less clear how selection on adaptive or detrimental genes interplay with random forces. We investigated sequence variation at ...
Natural selection, genetic drift and gene flow do not act in isolation, so we must consider how the interplay among these mechanisms influences evolutionary trajectories in natural populations. This issue is crucially important to conservation geneticists, who grapple with the implications of th...
Evolutionary biologists have long sought a way to determine whether a phenotypic difference between two taxa was caused by natural selection or random genetic drift. Here I argue that data from quantitative trait locus (QTL) analyses can be used to test the null hypothesis of neutral phenotypic ev...
Explores the roles of genetic drift and natural selection which affect the change in a population through simulation activity. Materials used; Preparation of students on the exercise activity; Results and discussion; Examples used to reinforce the concepts of natural selection.Maret...
Natural selection and genetic drift are two important forces driving microevolutionary change. Assuming that the current and historical island populations diverged by isolation and genetic drift, and know- ing viviparity only occurs in the island populations, we suggest natural selection under particular...
KIMURA and others 1–4 have suggested that most observed isoallelic variation in natural populations is maintained by mutation pressure and drift alone an... C Wills,L Nichols - 《Nature》 被引量: 49发表: 1971年 Genetic Drift and Effective Population Size Like other species of Drosophila, Dros...
Indigenous Iranian horse breeds were evolutionarily affected by natural and artificial selection in distinct phylogeographic clades, which shaped their genomes in several unique ways. The aims of this study were to evaluate the genetic diversity and geno
There are few convincing examples of genetic drift at loci under selection in natural populations. The plant sexual polymorphism tristyly provides an opportunity to investigate genetic drift because stochastic processes interacting with frequency-dependent selection give rise to a diagnostic pattern of morph...
(Tor putitora)38,68,69,70. Genetic diversity allows species to adapt and survive in changing environments by counteracting the effects of genetic drift71. Species with high genetic diversity are likely to maintain their high genetic diversity, even if they are endangered, unless the population ...
Nevertheless, at least in Europe, the adverse encroachment of human activity on the boreal and temperate woodlands that form the natural habitat for these species, coupled with the fact that climate is changing faster now than at any time in the past, means that the impacts on the gene pools...