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. What is a possible phenotype for the father?

A. A-positive
B. O-positive
C. B-positive
D. All of the above

Answer 1

The possible phenotype for the father of the AB Rh-negative mother is A-positive, B-positive, or O-positive.

Step-by-step explanation:

The possible phenotype for the father of the AB Rh-negative mother is A-positive, B-positive, or O-positive.

Since the mother is AB, she can pass either the A or the B allele to her children. Therefore, her daughter can be A-positive if she passes the A allele, and her son can be B-negative if she passes the B allele. The father must have either the A or B allele to contribute to the offspring's blood types, making A-positive and B-positive possible phenotypes.

So, the correct answer is D. All of the above.