Random changes in the number of alleles in a population can occur occasionally. Genetic drift refers to these fluctuations in relative allele frequency that may occur more frequently or less frequently throughout time. In these circumstances, genetic drift may cause the loss of uncommon alleles and a reduction in the gene pool. The possibility that genetic drift contributes to the evolution of new species is supported by the fact that genetic drift can result in a new population is genetically distinct from its ancestral population.
Genetic drift is the generational change in allele frequencies in a population that results from random events. To be more precise, genetic drift is a change brought on by "sampling error" when choosing alleles from the gene pool of the current generation for the following generation.
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