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 Parents
- The mother's blood group is A, which can have the following genotypes:
- Homozygous: \( I^A I^A \)
- Heterozygous: \( I^A i \) (where \( i \) represents the O allele)

- The father's blood group is B, which can have the following genotypes:
- Homozygous: \( I^B I^B \)
- Heterozygous: \( I^B i \)

### Step 2: Determine Possible Gametes
- From the mother (A blood group):
- If she is \( I^A I^A \), she can only produce gametes with \( I^A \).
- If she is \( I^A i \), she can produce gametes with \( I^A \) or \( i \).

- From the father (B blood group):
- If he is \( I^B I^B \), he can only produce gametes with \( I^B \).
- If he is \( I^B i \), he can produce gametes with \( I^B \) or \( i \).

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

1. **Mother: \( I^A I^A \) and Father: \( I^B I^B \)**
- Possible child genotype: \( I^A I^B \) (Blood group AB)

2. **Mother: \( I^A I^A \) and Father: \( I^B i \)**
- Possible child genotypes: \( I^A I^B \) (Blood group AB) or \( I^A i \) (Blood group A)

3. **Mother: \( I^A i \) and Father: \( I^B I^B \)**
- Possible child genotypes: \( I^A I^B \) (Blood group AB) or \( I^A i \) (Blood group A)

4. **Mother: \( I^A i \) and Father: \( I^B i \)**
- Possible child genotypes: \( I^A I^B \) (Blood group AB), \( I^A i \) (Blood group A), \( I^B i \) (Blood group B), or \( ii \) (Blood group O)

### Step 4: List All Possible Blood Groups
From the combinations above, the possible blood groups for the child are:
- AB (from \( I^A I^B \))
- A (from \( I^A i \))
- B (from \( I^B i \))
- O (from \( ii \))

### Conclusion
The possible blood groups for the child when the mother is A and the father is B are:
- A
- B
- AB
- O

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

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