Lampbrush chromosomes are visible

Options

A. prophase of mitosis
B. diplotene of meiosis
C. metaphase of meiosis
D. interphase

Explanation

**Step-by-Step Solution:**

1. **Understanding Lampbrush Chromosomes**:
- Lampbrush chromosomes are specialized structures that are primarily found in the growing oocytes (egg cells) of many animals, except for mammals. They are characterized by their unique appearance, which resembles a brush used for cleaning lamps.

2. **Identifying the Stage of Cell Division**:
- Lampbrush chromosomes are most notably observed during a specific phase of meiosis. The key phase where they are visible is during the diplotene stage of prophase I in meiosis.

3. **Reason for Visibility**:
- The distinct structure of lampbrush chromosomes is due to the active transcription of many genes. This transcriptional activity is what gives them their characteristic "lampbrush" appearance, as the loops of chromatin extend outward.

4. **Evaluating the Options**:
- The options provided are:
- Prophase of mitosis
- Diplotene of mitosis
- Diplotene of meiosis
- Metaphase of meiosis
- Interphase
- Since lampbrush chromosomes are specifically associated with the diplotene stage of meiosis, the correct answer is "diplotene of meiosis".

5. **Conclusion**:
- Therefore, the answer to the question "Lampbrush chromosomes are visible" is the diplotene stage of meiosis.

**Final Answer**: Diplotene of meiosis.

---