X-chromosome is

Options

A. Telocentric
B. Metacentric
C. Acrocentric
D. Acentric

Answer

**Step-by-Step Solution:**

1. **Understanding Chromosome Types**:
- Chromosomes can be classified based on the position of their centromeres. The main types are:
- **Telocentric**: Centromere is located at one end of the chromosome.
- **Metacentric**: Centromere is located in the middle, resulting in two arms of equal length.
- **Acrocentric**: Centromere is located closer to one end, creating one long arm and one short arm.
- **Acentric**: A fragment of a chromosome that lacks a centromere.

2. **Identifying the X-Chromosome**:
- The X chromosome is known for its characteristic shape. It is typically described as having a metacentric structure.

3. **Evaluating the Options**:
- **Option A (Telocentric)**: Incorrect, as the X chromosome does not have the centromere at the end.
- **Option B (Metacentric)**: Correct, as the X chromosome has its centromere in the middle, giving it two equal arms.
- **Option C (Acrocentric)**: Incorrect, since the centromere is not near one end.
- **Option D (Acentric)**: Incorrect, as the X chromosome has a centromere.

4. **Conclusion**:
- Based on the definitions and characteristics of the X chromosome, the correct answer is **Option B (Metacentric)**.

---