If a man of blood group A marries a woman of blood group B, their children can be of the blood group

Options

A. A only
B. B only
C. O only
D. A or B or AB only

Answer

To determine the possible blood groups of the children from a man with blood group A and a woman with blood group B, we need to consider the genetics of blood groups.

### Step-by-Step Solution:

1. **Understand Blood Group Genetics**:
- Blood groups are determined by the ABO blood group system, which includes four main types: A, B, AB, and O.
- Blood group A can be represented as either genotype AA or AO.
- Blood group B can be represented as either genotype BB or BO.

2. **Determine Possible Genotypes of Parents**:
- The man with blood group A could have the genotype AA or AO.
- The woman with blood group B could have the genotype BB or BO.

3. **Create a Punnett Square**:
- We will consider all combinations of the parents' genotypes.
- If the man is AA and the woman is BB:
- All children will be AB (blood group AB).
- If the man is AA and the woman is BO:
- Children can be AB (from A and B) or AO (blood group A).
- If the man is AO and the woman is BB:
- Children can be AB (from A and B) or BO (blood group B).
- If the man is AO and the woman is BO:
- Children can be AB (from A and B), AO (blood group A), BO (blood group B), or OO (blood group O).

4. **List Possible Blood Groups of Children**:
- From the combinations above, the possible blood groups of the children are:
- Blood group A (from AO)
- Blood group B (from BO)
- Blood group AB (from AB)
- Blood group O (only if both parents are AO and BO)

5. **Conclusion**:
- Therefore, the children of a man with blood group A and a woman with blood group B can have blood groups A, B, AB, or O, depending on the specific genotypes of the parents.

### Summary of Possible Blood Groups:
- Blood Group A
- Blood Group B
- Blood Group AB
- Blood Group O