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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.
In this biology simulation, students use a mathematical simulation of genetic drift to answer questions about the factors that influence this evolutionary process.Students run a series of simulations varying allele frequency and population size and then analyze their data and propose a model to explain their results. Students analyze data and use this data to form a model of how genetic drift works. 2  Students explain how population size and allele frequency and could contribute to loss of an allele in a population.