Which of the following blood groups may be present in the

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Which of the following blood groups may be present in the children of a couple having blood groups A and B, respectively?

1. A and B only
2. A, B and AB
3. A, B, AB and O
4. AB only

Correct Option: C

A heterozygous woman with type A blood and a heterozygous man with type B blood have, as you figured with your Punnet square, a 25% chance with each child that the child will have blood group O, 25% chance for blood group A, 25% chance for blood group B, and 25% chance for blood group AB. The same is true for the reciprocal cross: a heterozygous woman with type B blood and a heterozygous man with type A blood. In such a family, the existence of a child with blood group O is evidence that both parents are heterozygous.