If mother's blood group is A and father's blood group is B , child's blood could be

Options

A. A, B, AB
B. A, B
C. A, B , AB, O
D. A, AB

Answer

To determine the possible blood groups of a child when the mother's blood group is A and the father's blood group is B, we can follow these steps:

### Step 1: Identify the Genotypes of the Parents
- The mother's blood group A can be either homozygous (IAIA) or heterozygous (IAi).
- The father's blood group B can also be either homozygous (IBIB) or heterozygous (IBi).

### Step 2: Determine Possible Gametes
- If the mother is homozygous (IAIA), she can only produce gametes with the IA allele.
- If the mother is heterozygous (IAi), she can produce gametes with either IA or i.
- If the father is homozygous (IBIB), he can only produce gametes with the IB allele.
- If the father is heterozygous (IBi), he can produce gametes with either IB or i.

### Step 3: Create a Punnett Square
We will consider all combinations of the parents' genotypes:

1. **Mother: IAIA and Father: IBIB**
- Gametes: IA x IB
- Possible offspring: IAIB (Blood group AB)

2. **Mother: IAIA and Father: IBi**
- Gametes: IA x IB and IA x i
- Possible offspring: IAIB (Blood group AB) and IAi (Blood group A)

3. **Mother: IAi and Father: IBIB**
- Gametes: IA x IB and i x IB
- Possible offspring: IAIB (Blood group AB) and IBi (Blood group B)

4. **Mother: IAi and Father: IBi**
- Gametes: IA x IB, IA x i, i x IB, i x i
- Possible offspring: IAIB (Blood group AB), IAi (Blood group A), IBi (Blood group B), and ii (Blood group O)

### Step 4: List All Possible Blood Groups
From the combinations above, the possible blood groups for the child can be:
- A (IAi)
- B (IBi)
- AB (IAIB)
- O (ii)

### Conclusion
The child's blood group could be A, B, AB, or O.