Question

A man of A blood group marries a woman of the AB blood group. Which type of progeny would indicate that man is heterozygous for blood group A?

• A. AB
• B. A
• C. O
• D. B

Answer 1

The correct option is D B


From the above cross, it is clear that the occurence of B blood group progeny indicates that man is heterozygous for the allele A. If the man is homozygous for the allele A, the progeny will have either an A or AB type blood group.