Amother has blood type a and her son has blood type o. which blood types are possible for the father? a b ab o

The child's father has type O blood.

Explanation:

A child inherits from its parents the alleles that will determine the child's blood system. Therefore, if the child's mother has type A blood and the child has type O blood, that child may only have inherited this from his parents who also have type O blood.

For the ABO system, we say that a person has type A blood, if he has agglutinogens A in his red blood cells and, in plasma, anti-B agglutinins. The schedule happens to people of type B blood.

The presence or absence of agglutinogens in people's blood is determined by genes IA, IB or i. The IA and IB genes are dominant over the i gene. The IA gene, for example, determines the production of an enzyme that synthesizes agglutinogen A. Therefore, if one person has the IA IA genotype and another person has the IA i genotype, the red blood cells of both have agglutinogen A, that is, , they have blood type A. Something similar occurs in the case of people of blood type B. But people of type AB have genotype IA IB, because there is no dominance between these two genes. These people are capable of synthesizing both agglutinogen A and B. Finally, a type O person has genotype ii, that is, he does not have the enzymes necessary for the manufacture of neither agglutinogen.

it is either c or d and i know for sure it is not a or b