A woman with type O blood has children with her husband who is type AB. What percent of their children would you expect to have type O blood?

Blood types A, B, AB, and O are identified by the presence of antigens A and B. Since blood type O has no antigens, its members are universal donors.

When dominant allele I A is present in a homozygous (IA IA) or heterozygous (IA i) state, antigen A is produced. An individual with genotypes IA IA or IA i will have the blood group A.

When dominant allele I B is present in a homozygous (IB IB) or heterozygous (IB i) state, antigen B is produced. An individual with genotypes IB IB or IB Ii will have blood group B.

A person with the recessive allele in homozygous state (ii) will not produce any antigen and will have the blood group O. The recessive allele i does not produce any antigen.

Given that her husband has AB blood group and therefore genotype IA IB, the woman in question has O blood group and genotype (ii).

Each child receives one allele from each parent; therefore, the mother will give each child the recessive allele (i), and the father will give each child either the IA or the IB.

Since none of the offspring of this couple can be homozygous for the recessive allele (ii), none of them will have the blood group O.

Since the husband's blood type is AB, he must have inherited an A allele from one parent and a B allele from the other. Since the wife has type O blood, she can only pass on O alleles to her children. Therefore, all of their children would inherit one O allele from the mother. This means that all of their children would have either type A or type B blood, resulting in 0% of their children having type O blood.