Breeders can use a Punnett square to predict the outcome of a genetic cross. If the genotype of both parents was Aa, what would be expected of the genotypes among their possible offspring?

Each parent can pass on either A or a. The four equally likely combinations are AA, Aa, Aa, and aa, so two out of four offspring—one-half—would have genotype Aa. Therefore, the correct choice is “Half would have the genotype Aa.”

AI-written and checked against the verified answer.