The table expresses parental mating frequencies in the currency of genotype frequencies. For example, we expect matings between AA moms and Aa dads to occur with a frequency of XY.

Next we need to determine the frequency of each genotype in the offspring of any given parental mating pair. This will require that we predict the offspring genotypes resulting from each possible parental mating. We can do this easily with a Punnett square. We will use the frequencies of each parental mating (above) together with the frequencies of the offspring genotypes. Summed for all possible parental matings, this gives the frequency of offspring genotypes one generation later, or in generation t + 1. A table will help organize all the frequencies, like the offspring frequency table (generation t + 1) shown below.

Offspring genotype frequencies

Parental mating

Total frequency

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