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Genetic drift is a change in gene frequency within a population due to chance instead of natural selection. If the population is small, then there can be considerable genetic drift, which can change the gene frequency quite drastically. Think of the genetic variation of a population as a bowl of jelly beans with all sorts of colors, representing healthy genetic variation.
someone correct me if I'm wrong but this is what I think of: Gene flow is when you introduce or remove alleles because of individuals enter or leave population (Think: alleles flowing in and out). Genetic drift is the RANDOM change in allele frequency in a population.ene flow tends to reduce genetic variation between these to populations, but increase it overall. Notice, @LookingForASpot, that you are saying a small group from a population (very important).. Genetic drift is a change in gene frequency due to statistical (chance) fluctuations in a finite population.