Mother and Father of a person with ‘O’ blood group have ‘A’ and ‘B’ blood group respectively. What would be the genotype of both mother and father?

Options

A. Mother will be heterozygous for ‘A’ blood group, father will be homozygous for ‘B’ blood group.
B. Mother will be homozygous for ‘A’ blood group, father will be heterozygous for ‘B’ blood group.
C. Both Mother and Father will be homozygous for ‘A’ and ‘B’ blood group
D. Both Mother and Father will be heterozygous for ‘A’ and ‘B’ blood group

Answer

To determine the genotypes of the mother and father of a person with an 'O' blood group, we need to understand the inheritance of blood groups and the corresponding genotypes.

### Step-by-Step Solution:

1. **Understanding Blood Groups**:
- Blood groups are determined by the presence of antigens on the surface of red blood cells. The main blood group alleles are A (IA), B (IB), and O (i).
- The O blood group is recessive, meaning that a person must inherit two 'O' alleles (ii) to express this blood type.

2. **Parental Blood Groups**:
- The mother has an 'A' blood group, which can be either homozygous (IAIA) or heterozygous (IAi).
- The father has a 'B' blood group, which can also be either homozygous (IBIB) or heterozygous (IBi).

3. **Child's Blood Group**:
- The child has an 'O' blood group (ii). For this to occur, the child must inherit one 'i' allele from each parent.

4. **Determining the Genotypes**:
- Since the child has an 'O' blood group, the mother must have at least one 'i' allele. Therefore, the mother must be heterozygous (IAi).
- Similarly, the father must also have at least one 'i' allele, making him heterozygous (IBi).

5. **Conclusion**:
- The genotype of the mother is IAi (heterozygous A).
- The genotype of the father is IBi (heterozygous B).

### Final Answer:
- Mother: IAi (heterozygous A)
- Father: IBi (heterozygous B)