Synaptonemal complex is visible from

Options

A. Diplotene to Diakinesis
B. Leptotene to zygotene
C. zygotene to pachytene
D. Metaphase to Telophase

Answer

To solve the question regarding the visibility of the synaptonemal complex, we need to understand the stages of meiosis, particularly prophase I. Here's a step-by-step breakdown:

### Step-by-Step Solution:

1. **Understanding Meiosis**: Meiosis consists of two main divisions: meiosis I and meiosis II. Prophase I is the first stage of meiosis I and is divided into several sub-stages.

2. **Identifying Prophase I Stages**: The stages of prophase I are:
- Leptotene
- Zygotene
- Pachytene
- Diplotene
- Diakinesis

3. **Function of the Synaptonemal Complex**: The synaptonemal complex is a protein structure that forms between homologous chromosomes during meiosis. It plays a crucial role in the pairing of homologous chromosomes and facilitates crossing over.

4. **Visibility of the Synaptonemal Complex**:
- The synaptonemal complex first becomes visible during the **zygotene** stage when homologous chromosomes begin to pair.
- It remains visible through the **pachytene** stage, where crossing over occurs.
- After the pachytene stage, the synaptonemal complex begins to disassemble during the **diplotene** stage.

5. **Conclusion**: Therefore, the synaptonemal complex is visible from the **zygotene** stage to the **pachytene** stage of prophase I.

### Final Answer:
The synaptonemal complex is visible from **zygotene to pachytene**.