Explain how does  small population size may alter the gene frequency

Explain how does  small population size may alter the gene frequency

In a small population genetic drift is common because not all the allele which are representative of that species may be present. It is very possible for new alleles to appear and present ones to disappear simply by chance. Chance events such as accidental death prior to maturity of an organism which is the sole possessor of a particular allele would result in elimination of the allele from the population, reducing its frequency. Equally possible. An allele may drift to a higher frequency simply by chance.

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