Question

A woman who belongs to blood group ab and is rh negative has a daughter who is a positive and a son who is b negative. rh positive is simple dominant over rh negative. which of the following is/are a possible phenotype(s) for the father? a woman who belongs to blood group ab and is rh negative has a daughter who is a positive and a son who is b negative. rh positive is simple dominant over rh negative. which of the following is/are a possible phenotype(s) for the father?

a. positive
b. negative
c. all of the above
d. none of the above

Answer 1

The father could have any ABO blood type, with either Rh positive or negative status, to result in a daughter with A positive and a son with B negative blood types.

Step-by-step explanation:

In this scenario, we are dealing with inheritance of the ABO and Rh blood group systems. Given that the mother is of blood type AB negative, she has the genotype IAIB and is Rh negative (rh-rh). The daughter's blood type is A positive, indicating that she must have inherited A (IA) from one parent and the Rh positive allele from the other parent, since she is Rh positive. The son's blood type is B negative, which means he would have the B (IB) allele from one parent and Rh negative from both parents since Rh negative is recessive.

For the phenotypes of the father, considering both children, he must have at least the IB allele or the IA allele (since we have a child with A and another with B blood type), and at least one Rh positive allele to pass on to the daughter. Therefore, the father can have a phenotype of A positive, B positive, AB positive, or O positive, as he must contribute the Rh positive allele to the daughter. Since Rh positive is dominant, the father can also carry the recessive Rh negative allele, making options like A negative, B negative, AB negative, and O negative also possible. Hence, the father could have any ABO blood type, with either Rh positive or negative status.