Lampbrush chromosomes found in oocytes occur in

Options

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

Answer

To answer the question regarding the occurrence of lampbrush chromosomes in oocytes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Context**:
- Lampbrush chromosomes are specialized structures that are observed in the oocytes (egg cells) of many animals during a specific stage of meiosis.

2. **Identify the Stages of Meiosis**:
- Meiosis consists of several stages, particularly during prophase I, which includes leptotene, zygotene, pachytene, and diplotene.

3. **Focus on Lampbrush Chromosomes**:
- Lampbrush chromosomes are characterized by their extended structure and are associated with active transcription of genes. They are particularly prominent in the diplotene stage of prophase I.

4. **Determine the Correct Stage**:
- Among the stages provided (leptotene, zygotene, pachytene, and diplotene), lampbrush chromosomes are specifically found during the diplotene stage.

5. **Conclude the Answer**:
- Therefore, the correct answer to the question is **diplotene**.

### Final Answer:
Lampbrush chromosomes found in oocytes occur in **diplotene**.

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