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Figure 4.11 A hypothetical example of how the Wahlund effect relates variation in allele frequency between subdivided populations and genotype frequencies in a single panmictic population. Initially, the two subpopulations have different allele frequencies and therefore different frequencies of homozygous recessive albino phenotypes. The average frequency of the albino phenotype is 8% in the subpopulations. When the populations fuse, the allele frequencies become the average of the two subpopulations. However, the genotype frequencies are not the average of the two subpopulations. Rather, homozygotes become less frequent and heterozygotes more frequent than their respective subpopulation averages. In the fused population, the degree to which the frequencies of both homozygotes combined and the heterozygotes differ from their subpopulation averages is the same as the variance in allele frequency between the two subpopulations.

and then use that result to determine the expected frequency of homozygous recessive genotypes in the fused population:

qfused

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