A woman with blood type AB and a man with blood type O have three children, one of whom is adopted. The blood types of the children are A, B, and O. What is the blood type of the adopted child?
A) A
B) O
C) B
D) Not enough information is provided to answer this question.

Question

Quizplus · Accepted Answer

A person with blood type AB can only pass on A or B alleles to their offspring, and a person with blood type O can only pass on O alleles. Therefore, their biological children can only have blood types A or B, making the child with blood type O the adopted one.

A Woman with Blood Type AB and a Man with Blood