Which blood type would not be possible for children of a type AB mother and a type A father?
A. B
B. A
C. AB
D. O
The correct answer is D. O.
The ABO blood types are determined by the specific antigens present on the red blood cells.
A person with blood type AB has both A and B antigens on their red blood cells.
A person with blood type A has only the A antigen.
If a type AB mother and a type A father have children, the possible blood types for their children would be A, B, or AB.
Blood type O is characterized by the absence of A or B antigens, so it would not be possible for the children of an AB mother and an A father to have blood type O.