Choose the correctly matched pairs and correct option
(a) Leptotene - chromosomes become invisible
(b) Zygotene - pairing of homologous chromosomes
`(c)`Pachytene - Dissolution of synaptonemal complex takes place
(d) Diplotene - Bivalent chromosomes appear as tetrads
(e) Diakinesis - Terminalisation of chiasmata takes place

Options

A. a, b correct
B. b, d correct
C. b, d, e correct
D. b, c correct

Answer

To solve the question, we need to analyze each of the pairs provided and determine whether they are correctly matched or not. Here’s the step-by-step breakdown:

1. **Leptotene - chromosomes become invisible**
- **Analysis**: This statement is incorrect. Leptotene is the first stage of prophase I of meiosis, where chromosomes begin to condense and become visible, not invisible.
- **Conclusion**: Incorrect.

2. **Zygotene - pairing of homologous chromosomes**
- **Analysis**: This statement is correct. During the zygotene stage, homologous chromosomes undergo synapsis, meaning they pair up closely with each other.
- **Conclusion**: Correct.

3. **Pachytene - dissolution of synaptonemal complex takes place**
- **Analysis**: This statement is incorrect. The dissolution of the synaptonemal complex occurs during the diplotene stage, while in pachytene, crossing over occurs between non-sister chromatids.
- **Conclusion**: Incorrect.

4. **Diplotene - bivalent chromosomes appear as tetrads**
- **Analysis**: This statement is correct. In the diplotene stage, the homologous chromosomes remain attached at the chiasmata, and they can be observed as tetrads.
- **Conclusion**: Correct.

5. **Diakinesis - terminalization of chiasmata takes place**
- **Analysis**: This statement is correct. Diakinesis is the final stage of prophase I where the chiasmata move to the ends of the chromosomes, a process known as terminalization.
- **Conclusion**: Correct.

### Summary of Correct and Incorrect Matches:
- A: Incorrect
- B: Correct
- C: Incorrect
- D: Correct
- E: Correct

### Correct Options:
The correctly matched pairs are B, D, and E.

### Final Answer:
The correct option is B, D, E.

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