Quantifying: Allele and genotype frequencies - 2 alleles

Select on the main menu Allele and Genotype Frequencies and then select Quantifying: 2 Alleles

A new window with five text boxes and a frequencies graphic will be displayed. To generate any result, only the values of P(AA) and P(Aa) are needed. All the other frequencies are calculated as you type the required values. The graph has curves with frequencies at Hardy-Weinberg equilibrium, showing the variation of each genotypic frequency along different values of allelic frequencies. To generate a sample point inside the graph click OK.

 

Two examples of results are shown below. A shows a frequency point that is not under Hardy-Weinberg principle, while frequency in figure B are in Hardy-Weinberg equilibrium. The position of the frequency point on the x axis will depend on the allelic frequencies, while the point height depends on the frequency of heterozygotes. If the frequency point is on the parabola that represents 2pq these frequencies are in Hardy-Weinberg equilibrium. Curves for p^2 and q^2 are only illustrative and show the homozygote frequencies dependent on p and q.