A family has four children, whose blood types are A, B, AB, and O. What are the possible blood types of the parents?
A) A and O
B) O and B
C) B and AB
D) A and B
Answer: D) A and B
Biology Questions and Answers.
A) A and O
B) O and B
C) B and AB
D) A and B
Answer: D) A and B