Question

Mary, who has type O blood, is expecting a child with her husband, who has type AB blood. A blood type test reveals that the baby has type O blood. Is her husband the father of her child? How can you tell?

Answer 1

no.

Explanation: If you use a T chart you can see that the blood type must be either A or B.

Answer 2

No. If the parents are AB and O, the offspring can only be A or B.