Journal of Genetics and Molecular Biology

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Genetic Drift Review Articles

Genetic drift, can also be referred to as Sewall Wright effect or allelic drift, which is the change within the frequency of an existing gene variant (allele) during a population thanks to random sampling of organisms. The alleles within the offspring are a sample of those within the oldsters, and chance features a task in determining whether a given individual survives and reproduces. A population's allele frequency is that the fraction of the copies of 1 gene that share a specific form. Genetic drift may cause gene variants to disappear completely and thereby reduce genetic variation. It also can cause initially rare alleles to become far more frequent and even fixed.

When there are some copies of an allele or variant, the genetic drift effect is larger, and when there are many copies the genetic drift effect is smaller.  In the middle of 20th century, vigorous debates occurred over the relative importance of survival versus neutral processes, including genetic drift.

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