If a man with genotype AO marries a woman with genotype OO, what is the probability of having an A blood type child?

To determine the probability of having an A blood type child from a man with genotype AO (which indicates he has the A blood type) and a woman with genotype OO (which indicates she has the O blood type), we can analyze the potential genetic combinations that arise from their offspring.

The man with genotype AO can pass on either the A allele or the O allele. The woman with genotype OO can only pass on the O allele. The possible combinations of alleles for their children are as follows:

1. If the man passes on the A allele and the woman passes on one of her O alleles, the child will have genotype AO, which corresponds to blood type A.

2. If the man passes on the O allele and the woman passes on one of her O alleles, the child will have genotype OO, which corresponds to blood type O.

From these combinations, the outcomes for their children can be summarized as:

• AO (blood type A)

• OO (blood type O)

There are two equally likely outcomes: one results in blood type A and the other results in blood type O. Therefore, the probability of the child having blood type A (genotype AO) is 1 out of 2, or 50%. Hence