First husband of Asha had ABO blood Type A and Their child had type O.She remarried and her second husband had ABO blood type B and their child had types AB. What is the ABO gentypes of Asha and also name her blood type?

Options

A. ii, O
B. `I^(B)i,B`
C. `I^(A)I^(B),AB`
D. `I^(A)i,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 husbands.

### Step-by-Step Solution:

1. **Understanding Blood Types and Genotypes**:
- Blood type A can have genotypes IAIA (homozygous) or IAi (heterozygous).
- Blood type B can have genotypes IBIB (homozygous) or IBi (heterozygous).
- Blood type O has the genotype ii (homozygous recessive).
- Blood type AB has the genotype IAIB (co-dominant).

2. **Analyzing the First Marriage**:
- Asha's first husband has blood type A. Therefore, his genotype could be either IAIA or IAi.
- They had a child with blood type O (genotype ii). For this child to have type O blood, Asha must have contributed an i allele (since O is recessive).
- This means Asha's genotype must be at least IAi (heterozygous) because she must have an i allele to produce a child with type O blood.

3. **Analyzing the Second Marriage**:
- Asha's second husband has blood type B. His genotype could be either IBIB or IBi.
- They had a child with blood type AB (genotype IAIB). For this child to have type AB blood, Asha must have contributed the IA allele.
- Since the child is AB, Asha must have the IA allele.

4. **Conclusion on Asha's Genotype**:
- From the first marriage, we concluded Asha must have at least one i allele (IAi).
- From the second marriage, we concluded Asha must have the IA allele to contribute to the AB child.
- Therefore, Asha's genotype must be IAi (heterozygous A blood type).

5. **Determining Asha's Blood Type**:
- Since Asha's genotype is IAi, her blood type is A.

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