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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.
Best Answer: 1. Genetic Drift: This represents random changes in small gene pools due to sampling errors in propagation of alleles. The bottleneck effect and founder effect are prime examples of genetic drift.In either case the number of individuals in a population is drastically reduced distorting the original allelic frequencies. 2. Gene Flow: The movement of alleles into and out of a gene pool.Migration of an organism into different areas can cause the allelic frequencies of that population to increase.he bottleneck effect and founder effect are prime examples of genetic drift. In either case the number of individuals in a population is drastically reduced distorting the original allelic frequencies.