Leptotene chromosomes have

Options

A. two chromatids
B. one chromatid
C. four chromatids
D. no chromatid

Answer

### Step-by-Step Solution:

1. **Understanding Leptotene**:
- Leptotene is the first stage of prophase I in meiosis. During this stage, chromosomes start to condense and become visible under a microscope.

2. **Chromosome Structure**:
- Each chromosome is made up of two identical halves known as sister chromatids. These chromatids are joined together at a region called the centromere.

3. **Chromatids in Leptotene**:
- As the chromosomes condense during the leptotene stage, each chromosome consists of two chromatids. This means that at this stage, each chromosome is represented as two fine threads.

4. **Conclusion**:
- Therefore, we can conclude that leptotene chromosomes have **2 chromatids**.

5. **Final Answer**:
- The correct option is **A: 2 chromatids**.