Slipping of chiasmata towards the ends of bivalent is called :-

Options

A. Terminalisation
B. Diakinesis
C. Interkinesis
D. Heteropycnosis

Answer

To answer the question "Slipping of chiasmata towards the ends of bivalent is called:", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Chiasmata**:
- Chiasmata are points where homologous chromosomes remain attached to each other during meiosis after crossing over has occurred. This attachment is crucial for genetic recombination.

2. **Identifying the Stage of Meiosis**:
- The question refers to a specific stage in meiosis, particularly during prophase I. The relevant stage where chiasmata are observed is called diplotin.

3. **Movement of Chiasmata**:
- As homologous chromosomes begin to separate during the diplotin stage, the chiasmata (the points of attachment) start to move towards the ends of the chromosomes.

4. **Terminology**:
- The process of chiasmata moving towards the ends of the bivalent is specifically termed "terminalization." This is the correct term that describes this movement.

5. **Eliminating Incorrect Options**:
- **Diakinesis**: This is the final stage of prophase I, not the process of chiasmata movement.
- **Interkinesis**: This refers to the resting phase between meiosis I and meiosis II, which is not related to chiasmata.
- **Heteropyknosis**: This term describes the differential staining of chromosomes and is unrelated to chiasmata.

6. **Conclusion**:
- Therefore, the correct answer to the question is "terminalization," which describes the slipping of chiasmata towards the ends of the bivalent.

### Final Answer:
The slipping of chiasmata towards the ends of bivalent is called **terminalization**.

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