Which one is found in males only?

Options

A. X-chromosome
B. Y- chromosome
C. 2X-chromosomes
D. X+X chromosomes

Answer

**Step-by-Step Solution:**

1. **Understanding Chromosomes**: Humans have 23 pairs of chromosomes, which include 22 pairs of autosomes and 1 pair of sex chromosomes.

2. **Identifying Sex Chromosomes**: The sex chromosomes determine the biological sex of an individual. Males have one X and one Y chromosome (XY), while females have two X chromosomes (XX).

3. **Analyzing the Options**: The question provides four options:
- X chromosome
- Y chromosome
- 2X chromosome
- X plus X chromosome

4. **Evaluating Each Option**:
- **X chromosome**: Present in both males and females (XY and XX).
- **Y chromosome**: Present only in males (XY).
- **2X chromosome**: This configuration is only found in females (XX).
- **X plus X chromosome**: This also refers to females (XX).

5. **Conclusion**: The only chromosome that is found exclusively in males is the Y chromosome.

**Final Answer**: The Y chromosome is found in males only.

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