What is the allele frequency?

Allele frequency is a measure of the relative frequency of an allele on a genetic locus in a population. Usually it is expressed as a proportion or a percentage. In population genetics, allele frequencies show the genetic diversity of a species population or equivalently the richness of its gene pool.Let us consider, for example, a population of 100 diploid individuals. ... So the total number of A alleles in the population would be 20 + 10, for a total of 30. The allele frequency would be this number divided by the total number of gene copies (30/200) to yield 0.15, which is the allele frequency.Allele frequency refers to how common an allele is in a population. It is determined by counting how many times the allele appears in the population then dividing by the total number of copies of the gene. ... In a population, allele frequencies are a reflection of genetic diversity. Changes in allele frequencies over time can indicate that genetic drift is occurring or that new mutations have been introduced into the population.

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