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Genetic drift (or allelic drift) is the change in the frequency of a gene variant (allele) in a population due to random sampling of organisms.The alleles in the offspring are a sample of those in the parents, and chance has a role in determining whether a given individual survives and reproduces.A population's allele frequency is the fraction of the copies of one gene that share a particular form.hen there are few copies of an allele, the effect of genetic drift is larger, and when there are many copies the effect is smaller. In the early twentieth century vigorous debates occurred over the relative importance of natural selection versus neutral processes, including genetic drift.
Genetic recombination is one of several mechanisms leading to the variation observed in the genetic inheritance passed down the generations by sexual reproduction.his definition is commonly used in classical transmission genetics, evolutionary biology, and population genetics. Such shuffling can be the result of recombination via intra-chromososomal recombination or âcrossing over,â and via inter-chromososomal recombination also called independent assortment.