Blood group of Riddhi is 'A' and her mother Ramilaben has also blood group 'A'. Which blood group can be present in her father

Options

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

Answer

To determine which blood group can be present in Riddhi's father, we need to analyze the blood groups of Riddhi and her mother, Ramilaben.

### Step-by-Step Solution:

1. **Identify Riddhi's Blood Group**:
- Riddhi has blood group 'A'. This can be represented by the genotypes IAIA (homozygous) or IAi (heterozygous).

2. **Identify Mother's Blood Group**:
- Ramilaben also has blood group 'A', which means she can also have the genotypes IAIA or IAi.

3. **Possible Genotypes for the Father**:
- To find out the possible blood groups of Riddhi's father, we consider the combinations that can produce an 'A' blood group in Riddhi:
- **Father with Blood Group A (IAIA or IAi)**:
- If the father is IAIA, Riddhi can be IAIA or IAi.
- If the father is IAi, Riddhi can still be IAIA or IAi.
- **Father with Blood Group B (IBi or IBIB)**:
- If the father is IBi, Riddhi can be IAi (A blood group).
- If the father is IBIB, Riddhi cannot be A, so this is not possible.
- **Father with Blood Group O (ii)**:
- If the father is ii, Riddhi can only inherit A from the mother, resulting in IAi (A blood group).

4. **Conclusion**:
- The possible blood groups for Riddhi's father are:
- A (IAIA or IAi)
- B (IBi)
- O (ii)

Thus, the possible blood groups for Riddhi's father are A, B, or O.

### Final Answer:
Riddhi's father can have blood group A, B, or O.

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