A child with mother of A group and father of AB group, will not have the following blood group

Options

A. O
B. A
C. A and O
D. O and B

Answer

To solve the problem of determining which blood group a child with a mother of blood group A and a father of blood group AB cannot have, we will analyze the possible genotypes and phenotypes of the child based on the parents' blood groups.

### Step-by-Step Solution:

1. **Identify the Genotypes of the Parents:**
- The mother has blood group A. The possible genotypes for blood group A are:
- Homozygous: IAIA
- Heterozygous: IAi (where i represents the O allele)
- The father has blood group AB. The genotype for blood group AB is:
- IAIB

2. **Determine the Possible Genotypes of the Child:**
- We will consider both scenarios for the mother (homozygous and heterozygous) and cross them with the father's genotype (IAIB).

**Case 1: Mother is Homozygous (IAIA)**
- Cross:
- IAIA (mother) x IAIB (father)
- Possible offspring:
- IAIA (blood group A)
- IAIB (blood group AB)
- Resulting blood groups: A and AB

**Case 2: Mother is Heterozygous (IAi)**
- Cross:
- IAi (mother) x IAIB (father)
- Possible offspring:
- IAIA (blood group A)
- IAIB (blood group AB)
- IAi (blood group A)
- IBi (blood group B)
- Resulting blood groups: A, AB, and B

3. **Compile the Results:**
- From both cases, the possible blood groups for the child are:
- From Case 1: A, AB
- From Case 2: A, AB, B
- In both scenarios, the child cannot have blood group O.

4. **Conclusion:**
- Therefore, the child with a mother of blood group A and a father of blood group AB will not have blood group O.

### Final Answer:
The child will not have blood group O.