random genetic drift(redirected from Sewall Wright effect)
random genetic drift
See genetic drift.
random genetic drift (RGD) or Sewall Wright effectchanges in ALLELE frequency in a population from one generation to another due to chance fluctuations. RGD is important in small populations which are subject to sampling error and where an allele can be lost (0% frequency) or fixed (100%).
The phenomenon was first described by the American geneticist Sewall Wright.