During Meiosis 1, in which stage synapsis takes place ?

Options

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

Answer

To answer the question, "During Meiosis 1, in which stage does synapsis take place?" we need to examine the stages of Prophase I of Meiosis I.

### Step-by-Step Solution:

1. **Understanding Meiosis I**: Meiosis I consists of several stages, and Prophase I is divided into sub-stages: Leptotene, Zygotene, Pachytene, and Diplotene.

2. **Identifying the Stages**:
- **Leptotene**: This is the first stage of Prophase I where chromosomes start to condense and become visible.
- **Zygotene**: In this stage, homologous chromosomes begin to pair up in a process called synapsis.
- **Pachytene**: This stage follows Zygotene, where the paired chromosomes (bivalents) undergo crossing over.
- **Diplotene**: In this stage, the homologous chromosomes begin to separate but remain attached at crossover points.

3. **Focusing on Synapsis**: The question specifically asks about synapsis, which is the pairing of homologous chromosomes. This process occurs during the Zygotene stage.

4. **Conclusion**: Therefore, the correct answer to the question is that synapsis takes place during the **Zygotene** stage of Meiosis I.

### Final Answer:
**Synapsis occurs during the Zygotene stage of Meiosis I.**

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