Question

what is genetic drift?​

Answer 1

Genetic drift (also known as allelic drift or the Sewall Wright effect)[1] is the change in the frequency of an existing gene variant (allele) in a population due to random sampling of organisms.[2] 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.[3] Genetic drift may cause gene variants to disappear completely and thereby reduce genetic variation.[4] It can also cause initially rare alleles to become much more frequent and even fixed.

When 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 20th century, vigorous debates occurred over the relative importance of natural selection versus neutral processes, including genetic drift. Ronald Fisher, who explained natural selection using Mendelian genetics,[5] held the view that genetic drift plays at the most a minor role in evolution, and this remained the dominant view for several decades. In 1968, population geneticist Motoo Kimura rekindled the debate with his neutral theory of molecular evolution, which claims that most instances where a genetic change spreads across a population (although not necessarily changes in phenotypes) are caused by genetic drift acting on neutral mutations.[6][7]

Answer 2

Answer:

Explanation:

Genetic drift is defined as:

                    It is the change in frequency of alleles

                   at a locus by chance.

• Genetic drift is one of the factors that can alter gene frequency.
• It affect the proportion of homozygotes and heterozygotes enough to produce significant variations from the proportion claimed by Hardy Weinberg Theorem.

In small populations,such fluctuations may lead to the loss of particular alleles.

This may occur in small population when a few individual fail to reproduce and then genes are lost from the population.

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