Ovum producing Klinefelter's syndrome shall have chromosome number

Options

A. 21
B. 22
C. 23
D. 24

Answer

To solve the question regarding the chromosome number of an ovum producing Klinefelter's syndrome, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Klinefelter's Syndrome**:
- Klinefelter's syndrome is a genetic condition that affects males and is characterized by the presence of an extra X chromosome.

2. **Normal Chromosome Count in Humans**:
- Humans typically have 46 chromosomes, which are organized into 23 pairs. This includes 22 pairs of autosomes and 1 pair of sex chromosomes (XX for females and XY for males).

3. **Identify the Chromosome Composition in Klinefelter's Syndrome**:
- In Klinefelter's syndrome, males have an additional X chromosome, resulting in a chromosome composition of XXY.

4. **Calculate the Total Chromosome Number**:
- The normal male has 46 chromosomes (23 pairs), but with the additional X chromosome in Klinefelter's syndrome, the total becomes 47 chromosomes.

5. **Determine the Chromosome Number of the Ovum**:
- The ovum (egg) contributes one set of sex chromosomes. In the case of Klinefelter's syndrome (XXY), the ovum must carry one X chromosome.
- Since the ovum contributes only one set of chromosomes, it will have a total of 24 chromosomes (23 from the normal set plus the extra X chromosome).

6. **Final Answer**:
- Therefore, the ovum producing Klinefelter's syndrome shall have a chromosome number of 24.