Assertion :- Zygotene is charactersed by formation of synaptonemal complex .
Reason :- Synoptonemal complex helps in synapsis of non homologous chromosomes.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are false.

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Zygotene is characterized by the formation of the synaptonemal complex."
- Zygotene is indeed a stage in prophase I of meiosis, where homologous chromosomes begin to pair up.

2. **Identifying the Role of the Synaptonemal Complex**:
- The synaptonemal complex is a protein structure that forms between homologous chromosomes during zygotene.
- It facilitates the pairing of homologous chromosomes, which is crucial for genetic recombination.

3. **Understanding the Reason**:
- The reason provided states that "the synaptonemal complex helps in the synapsis of non-homologous chromosomes."
- This statement is incorrect because the synaptonemal complex is specifically involved in the synapsis of homologous chromosomes, not non-homologous ones.

4. **Conclusion**:
- Since the assertion is true (zygotene is characterized by the formation of the synaptonemal complex) and the reason is false (the synaptonemal complex does not assist in synapsis of non-homologous chromosomes), we conclude that the assertion is true and the reason is false.

### Final Answer:
- Assertion: True
- Reason: False