A child of a mother with blood group AB may have any one of the following blood groups except.

Options

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

Explanation

To solve the question regarding the possible blood groups of a child from a mother with blood group AB, we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Genotype of the Mother**:
- The mother has blood group AB. The genotype for blood group AB is \( I^A I^B \).

2. **Identify Possible Genotypes of the Father**:
- The question does not specify the father's blood group, but we will consider the possible blood groups. The father can have blood groups A, B, AB, or O. However, since the question is about the child of a mother with blood group AB, we will consider the father having blood group A (genotype \( I^A I^O \)) for our analysis.

3. **Set Up a Punnett Square**:
- We will create a Punnett square to determine the possible blood groups of the child. The mother's gametes (from genotype \( I^A I^B \)) can be \( I^A \) or \( I^B \). The father's gametes (from genotype \( I^A I^O \)) can be \( I^A \) or \( I^O \).

4. **Cross the Gametes**:
- The Punnett square will look like this:
```
I^A I^O
----------------
I^A | I^A I^A | I^A I^O |
----------------
I^B | I^A I^B | I^B I^O |
----------------
```
- The resulting genotypes from this cross are:
- \( I^A I^A \) (Blood group A)
- \( I^A I^B \) (Blood group AB)
- \( I^A I^O \) (Blood group A)
- \( I^B I^O \) (Blood group B)

5. **Determine the Possible Blood Groups**:
- From the Punnett square, the possible blood groups for the child are:
- Blood group A (from \( I^A I^A \) and \( I^A I^O \))
- Blood group AB (from \( I^A I^B \))
- Blood group B (from \( I^B I^O \))

6. **Identify the Blood Group that Cannot Occur**:
- The blood group O is not present in the results of the Punnett square. Therefore, a child of a mother with blood group AB cannot have blood group O.

### Final Answer:
The child of a mother with blood group AB may have any one of the following blood groups except blood group O.