The homologous chromosomes follow the process of synapsis in the stage or Pairing of homologous chromosome takes place in
Or
During which stage of meiosis, synaptonemal complex is formed

Options

A. Diplotene
B. Pachytene
C. Zygotene
D. Leptotene

Answer

To answer the question regarding the stage of meiosis in which homologous chromosomes undergo synapsis and where the synaptonemal complex is formed, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Meiosis**: Meiosis is a type of cell division that reduces the chromosome number by half, resulting in four haploid cells. It consists of two main stages: meiosis I and meiosis II, with meiosis I further divided into prophase I, metaphase I, anaphase I, and telophase I.

2. **Focus on Prophase I**: Prophase I of meiosis is a lengthy and complex phase that is divided into five sub-stages: leptotene, zygotene, pachytene, diplotene, and diakinesis.

3. **Identify the Stages**:
- **Leptotene**: Chromosomes start to condense and become visible.
- **Zygotene**: Homologous chromosomes begin to pair up (synapsis) and the synaptonemal complex forms.
- **Pachytene**: Crossing over occurs between homologous chromosomes.
- **Diplotene**: Homologous chromosomes start to separate but remain attached at chiasmata.
- **Diakinesis**: Chromosomes condense further and prepare for metaphase.

4. **Focus on Synapsis and Synaptonemal Complex**: The synaptonemal complex is a protein structure that forms between homologous chromosomes during the zygotene stage. This complex facilitates the pairing of homologous chromosomes, which is essential for the process of crossing over that occurs in the subsequent pachytene stage.

5. **Conclusion**: Based on the understanding of the stages of prophase I, the correct answer to the question is that synapsis and the formation of the synaptonemal complex occur during the **zygotene** stage of meiosis.

### Final Answer:
The homologous chromosomes follow the process of synapsis during the **zygotene** stage of meiosis, where the synaptonemal complex is formed.

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