genetic drift

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Biology Dictionary
	Definition:		The random change of the occurance of a particular gene in a population; genetic drift is thought to be one cause of speciation when a group of organisms is separated from its parent population.
Glossary
	Definition:		Random variation in gene frequency from one generation to another. the situation in a small population in which the allelic frequencies of the Fl generation will differ from those of the parental generation due to sampling error.