Go through the following events-
I. Termanlzation of chiasmata occurs
II. Chromosomes are fully condensed
III. Meiotic spindle is assembled
IV. By the end NM and nucleolus disappear
The above points indicate that it is -

Options

A. Zygotene stage
B. Diakinesis stage
C. Metaphase II
D. Pachytene

Answer

To solve the question regarding the events that indicate a specific stage in meiosis, we will analyze each event step by step.

### Step-by-Step Solution:

1. **Understanding the Events**:
- **Event I**: Terminalization of chiasmata occurs.
- **Event II**: Chromosomes are fully condensed.
- **Event III**: Meiotic spindle is assembled.
- **Event IV**: By the end, the nuclear membrane and nucleolus disappear.

2. **Identifying the Stage of Meiosis**:
- These events are characteristic of the later stages of meiosis, specifically during prophase I and the transition to metaphase I.
- The terminalization of chiasmata is a key feature that occurs during the **diakinesis** stage of prophase I, where homologous chromosomes are fully condensed and ready for separation.

3. **Analyzing Each Event**:
- **Event I (Terminalization of chiasmata)**: This indicates that crossing over has occurred and the chromosomes are preparing for separation, typical of diakinesis.
- **Event II (Chromosomes are fully condensed)**: Full condensation of chromosomes is also a hallmark of diakinesis, making them visible under a microscope.
- **Event III (Meiotic spindle is assembled)**: The assembly of the meiotic spindle is crucial for the separation of chromosomes and occurs as the cell prepares to enter metaphase.
- **Event IV (Nuclear membrane and nucleolus disappear)**: This signifies that the cell is transitioning to metaphase, which follows diakinesis.

4. **Conclusion**:
- Based on the analysis of the events, it is clear that these points indicate the **diakinesis stage** of meiosis, where significant preparations for chromosome separation occur.

### Final Answer:
The above points indicate that it is the **diakinesis stage** of meiosis.

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