The allele frequency (or gene frequency) is the rate at which a specific allele appears within a population. Population genetics is the study of how selective forces change a population through changes in allele and genotypic frequencies. For example, in a population of fifty people where all the blood types are represented, there may be more I A alleles than i alleles. Although each organism can only carry two alleles, more than those two alleles may be present in the larger population. In human blood type, the combinations are composed of two alleles such as I AI A or I AI B. Human blood types are A, B, AB, and O.Ī diploid organism can only carry two alleles for a particular gene. \( \newcommand\): ABO blood type in humans: In humans, each blood type corresponds to a combination of two alleles, which represent a the type of antigens displayed on the outside of a red blood cell.
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