If a man with blood group O and a woman with blood group AB have children, which blood group(s) could the children have?A. Group O onlyB. Groups A and B onlyC. Group AB onlyD. Groups O, A, B and AB

The possible blood groups of the children from a man with blood group O and a woman with blood group AB are A and B only. Therefore, the correct answer is B. Groups A and B only.

Here's the step by step explanation:

1. The man with blood group O can only pass on O alleles to his children because O blood type individuals have two O alleles (OO).

2. The woman with blood group AB can pass either A or B alleles to her children because AB blood type individuals have one A and one B allele (AB).

3. Therefore, the possible combinations for the children's blood groups are AO (which results in blood group A) or BO (which results in blood group B).

4. It's not possible for the children to have blood group O because they would need to receive an O allele from each parent, and the mother doesn't have an O allele to pass on.

5. Similarly, it's not possible for the children to have blood group AB because they would need to receive an A allele from one parent and a B allele from the other, but the father doesn't have an A or B allele to pass on.