Repulsion of homologous chromosomes takes place in

Options

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

Answer

To solve the question "Repulsion of homologous chromosomes takes place in," we will analyze each of the given options step by step.

### Step-by-Step Solution:

1. **Understanding the Phases of Meiosis**:
- Meiosis consists of several stages, particularly during prophase I, which includes leptotene, zygotene, pachytene, diplotene, and diakinesis.

2. **Analyzing the Options**:
- **Diakinesis**: This is the last stage of prophase I. By this stage, homologous chromosomes have already separated, and crossing over has occurred. Therefore, this option does not involve repulsion.
- **Diplotene**: This is a crucial phase where homologous chromosomes start to separate and uncoil. During this stage, repulsion occurs as the homologous chromosomes begin to repel each other, leading to their separation. This option is likely correct.
- **Zygotene**: This is the second stage of prophase I where homologous chromosomes begin to pair (synapsis). Since pairing occurs in this phase, repulsion does not take place here. Thus, this option is incorrect.
- **Leptotene**: This is the first stage of prophase I where chromosomes become visible as thin threads (chromatids). There is no repulsion of homologous chromosomes at this stage. Therefore, this option is also incorrect.

3. **Conclusion**:
- After analyzing all the options, we conclude that the repulsion of homologous chromosomes takes place during the **diplotene** stage of meiosis.

### Final Answer:
The repulsion of homologous chromosomes takes place in **diplotene**.

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