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Allelic frequencies after selection: p' = f(A') = f(A'A') + '/2 f(A'A2)

Allelic frequencies after selection: p' = f(A') = f(A'A') + '/2 f(A'A2)

The last step is to determine the genotypic frequencies in the next generation. In regard to our birds, these genotypic frequencies are those of the offspring of the birds that survived the winter. If the survivors mate randomly, the genotypic frequencies in the next generation will be p'2,2p'q', and q'2.

The general selection model can be used to calculate the allelic frequencies after any type of selection. It is also possible to work out formulas for determining the change in allelic frequency when selection is against recessive, dominant, and codominant traits, as well as traits in which the heterozygote has highest fitness (Table 23.5).

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