Synapsis found in between :–

Options

A. Nonhomologous chromosome
B. Homologous chromosome
C. Nonhomologous and homologous chromosome
D. Chromatids

Answer

### Step-by-Step Solution:

1. **Understanding Synapsis**:
- Synapsis is the process where homologous chromosomes pair up during cell division. This occurs during the prophase stage of meiosis, specifically in prophase I.

2. **Identifying the Stage of Meiosis**:
- In meiosis, there are two main stages: meiosis I and meiosis II. Synapsis occurs only in meiosis I, during prophase I.

3. **Homologous Chromosomes**:
- Homologous chromosomes are pairs of chromosomes that have the same structure and carry the same genes, but may have different alleles. During synapsis, these chromosomes align closely.

4. **Formation of Chiasmata**:
- As homologous chromosomes pair up, they form structures called chiasmata, where genetic material can be exchanged between non-sister chromatids. This process is known as crossing over.

5. **Evaluating the Options**:
- The question asks about the context in which synapsis occurs. The options provided include:
- Non-homologous chromosomes
- Homologous chromosomes
- Non-homologous chromosomes again
- Another incorrect option
- Since synapsis specifically involves the pairing of homologous chromosomes, the correct answer is the option that states "homologous chromosomes".

6. **Conclusion**:
- Therefore, the correct answer to the question "Synapsis found in between:" is **homologous chromosomes**.