Terminalisation of chiasmata takes place in

Options

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

Answer

To answer the question "Terminalisation of chiasmata takes place in," we need to analyze the different stages of meiosis and identify where terminalization occurs.

### Step-by-Step Solution:

1. **Understanding Chiasmata**: Chiasmata are the points where homologous chromosomes exchange genetic material during meiosis. This process is crucial for genetic diversity.

2. **Identifying Meiosis Stages**: Meiosis consists of several stages: Leptotene, Zygotene, Pachytene, Diplotene, and Diakinesis. We need to determine in which of these stages terminalization of chiasmata occurs.

3. **Analyzing Diplotene**: In the Diplotene stage, the synaptonemal complex disappears, and the homologous chromosomes begin to separate. However, terminalization does not occur here.

4. **Analyzing Diakinesis**: Diakinesis is the final stage of prophase I of meiosis. It is during this stage that the chiasmata move towards the ends of the chromosomes, a process known as terminalization. This is where the chromosomes become fully condensed and prepare for metaphase.

5. **Analyzing Pachytene**: In Pachytene, crossing over occurs, but terminalization does not take place at this stage.

6. **Analyzing Leptotene**: In Leptotene, chromosomes begin to condense, but again, terminalization is not observed.

7. **Conclusion**: Based on the analysis, terminalization of chiasmata occurs in the Diakinesis stage of meiosis.

### Final Answer:
Terminalisation of chiasmata takes place in **Diakinesis**.

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