Definitions for genetic drift
This page provides all possible meanings and translations of the word genetic drift
An overall shift of allele distribution in an isolated population, due to random fluctuations in the frequencies of individual alleles of the genes.
Genetic drift or allelic drift is the change in the frequency of a gene variant in a population due to random sampling. 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. Genetic drift may cause gene variants to disappear completely and thereby reduce genetic variation. 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. Vigorous debates occurred over the relative importance of natural selection versus neutral processes, including genetic drift. Ronald Fisher 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 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 are caused by genetic drift.
U.S. National Library of Medicine
The fluctuation of the ALLELE FREQUENCY from one generation to the next.
Find a translation for the genetic drift definition in other languages:
Select another language:
Discuss these genetic drift definitions with the community:
Word of the Day
Would you like us to send you a FREE new word definition delivered to your inbox daily?
Use the citation below to add this definition to your bibliography:
"genetic drift." Definitions.net. STANDS4 LLC, 2015. Web. 27 Apr. 2015. <http://www.definitions.net/definition/genetic drift>.