Allele frequency is the relative frequency of the alleles which are present at the particular loci in a population. In other words, we can say that it is that fraction of the chromosomes that carry the same allele in a population and hence it is used to describe the amount of variation present at that particular loci.
The change in the frequency of alleles leads to the phenomenon of microevolution. It is expressed in the form of a fraction and percentage. The allele and the genotype frequency are related to each other but are not the same things. It is possible to calculate the frequency of alleles by the genotype frequency.
Allele variation is a phenomenon which describes the presence as well as the number of different forms of alleles that are present at the particular loci on the chromosomes. Therefore, the overall diversity of the alleles in a given population can be determined by the allele variation.
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