Common
Allele frequency
Relative frequency of a variant of a gene at a particular locus in a population
Allele frequency
Allele frequency, or gene frequency, is the relative frequency of an allele (variant of a gene) at a particular locus in a population, expressed as a fraction or percentage. Specifically, it is the fraction of all chromosomes in the population that carry that allele over the total population or sample size. Evolution is the change in allele frequencies that occurs over time within a population. Given the following: A particular locus on a chromosome and a given allele at that locus A population of N individuals with ploidy n, i.e. an individual carries n copies of each chromosome in their somatic cells (e.g. two chromosomes in the cells of diploid species) The allele exists in i chromosomes in the population then the allele frequency is the fraction of all the occurrences i of that allele and the total number of chromosome copies across the population, i/(nN). The allele frequency is distinct from the genotype frequency, although they are related, and allele frequencies can be calculated...
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