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Fraction of individuals within a population sharing, at a given locus or loci, a specific combinations of alleles.
Commonly it is just one or at most a few loci, rather than an entire genome, over which genotype frequency is considered, and this is particularly the case for obligately sexual, diploid organisms, rather than over an entire genome. Alternatively, for clonal populations the frequency of a given genotype, due to a relative absence of genetic recombination, can be quite large even when considering a relatively large number of loci.
Note that for haploid organisms, the genotype frequency within a population for a given locus will be equivalent to the allele frequency. Indeed, for clonal, haploid organisms, it can be genotype frequencies rather than specifically allele frequencies that are followed in terms of their population genetics.
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