Solutions For An Introduction to Genetic Analysis Chapter 6 Problem 11P

In figure 6-21, an incomplete penetrance of the dominant gene (A) is shown in the pedigree. Q has a genotype A/a, and if this gene falls in a dominant allele there could hardly be any other parent to harbor the same mutation. Two children present in the last generation have complete penetrance of the dominant allele. The female R might be having the allele A, which is not visible in this case. Hence, the probability for R having A/a and a/a would be.