In mother has blood group AB, father has A group when Which of the following blood group will not found in the offspring.

Options

A. A
B. B
C. AB
D. O

Answer

To solve the question regarding the possible blood groups of offspring when the mother has blood group AB and the father has blood group A, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Genotypes of Parents**:
- The mother has blood group AB, which corresponds to the genotype IAIB.
- The father has blood group A. The genotype for blood group A can be either homozygous (IAIA) or heterozygous (IAi).

2. **Create a Punnett Square for Each Case**:
- **Case 1**: If the father is homozygous (IAIA):
- The possible gametes from the mother (IA and IB) and the father (IA and IA) will combine as follows:
- IA (from mother) + IA (from father) = IAIA (Blood group A)
- IB (from mother) + IA (from father) = IAIB (Blood group AB)
- Possible blood groups from this cross: A (IAIA) and AB (IAIB).

- **Case 2**: If the father is heterozygous (IAi):
- The possible gametes from the mother (IA and IB) and the father (IA and i) will combine as follows:
- IA (from mother) + IA (from father) = IAIA (Blood group A)
- IB (from mother) + IA (from father) = IAIB (Blood group AB)
- IA (from mother) + i (from father) = IAi (Blood group A)
- IB (from mother) + i (from father) = IBi (Blood group B)
- Possible blood groups from this cross: A (IAIA or IAi), AB (IAIB), and B (IBi).

3. **Determine the Blood Groups Not Possible**:
- In both cases, we see that the possible blood groups for the offspring are A, AB, and B.
- The blood group O (denoted by genotype ii) cannot be produced because neither parent can contribute the necessary recessive alleles (i) to form the O blood group.

4. **Conclusion**:
- The blood group that will not be found in the offspring is O.

### Final Answer:
The blood group that will not be found in the offspring is O.

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