In which of the following disease , the man has an extra X-chromosome ?

Options

A. Turner's syndrome
B. Klinefelter's syndrome
C. Bleeder's disease
D. Down's syndrome

Answer

**Step-by-Step Solution:**

1. **Understanding Chromosomes**:
- Chromosomes are structures within cells that carry genetic information. In humans, males typically have one X and one Y chromosome (XY), while females have two X chromosomes (XX).

2. **Identifying the Condition**:
- The question asks about a disease where a male has an extra X chromosome. This means that instead of the usual XY configuration, the male has an additional X chromosome, resulting in an XXY configuration.

3. **Klinefelter's Syndrome**:
- The condition characterized by the presence of an extra X chromosome in males is known as Klinefelter's syndrome. This syndrome occurs when a male has an XXY chromosomal pattern.

4. **Conclusion**:
- Therefore, the disease in which a man has an extra X chromosome is Klinefelter's syndrome. The correct answer to the question is option B.

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