First husband of Asha has ABO blood type A and their child has type O. She remarried and her husband has ABO blood type B and their child has type AB. What is the ABO genotype of Asha and also name her blood type.

Options

A. ii, blood type
B. `l^(B) l ^(O),` blood type B
C. `l^(A)l` blood type AB
D. `l^(A)l` blood type A

Answer

To solve the problem, we need to determine the ABO genotype of Asha based on the blood types of her children from two different marriages.

### Step-by-Step Solution:

1. **Identify the Blood Types and Genotypes of the Parents:**
- Asha's first husband has blood type A. The possible genotypes for blood type A are:
- IA IA (homozygous)
- IA i (heterozygous)
- Asha's first child has blood type O, which has the genotype ii.

2. **Determine Asha's Genotype from the First Marriage:**
- For the child to have blood type O (genotype ii), Asha must contribute an "i" allele. Therefore, Asha must have at least one "i" allele in her genotype.
- This means Asha's genotype must be IA i (blood type A) because if she were IA IA, she could not produce a child with blood type O.

3. **Identify the Blood Types and Genotypes of the Second Husband:**
- Asha's second husband has blood type B. The possible genotypes for blood type B are:
- IB IB (homozygous)
- IB i (heterozygous)

4. **Determine the Child's Genotype from the Second Marriage:**
- Asha's second child has blood type AB, which has the genotype IA IB.

5. **Determine the Genotype of Asha's Second Child:**
- For the child to have blood type AB (genotype IA IB), Asha must contribute the IA allele. This is consistent with Asha's genotype of IA i, as she can provide either IA or i.

6. **Conclusion:**
- Asha's genotype is IA i, which corresponds to blood type A.

### Final Answer:
Asha's ABO genotype is IA i, and her blood type is A.

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