Enzyme required for crossing over-

Answer

### Step-by-Step Solution:

1. **Understanding Crossing Over**:
- Crossing over is a genetic process that occurs during meiosis, where two non-sister chromatids of homologous chromosomes exchange segments of genetic material. This process increases genetic diversity in the offspring.

2. **Identifying the Context**:
- This process is crucial during the prophase I stage of meiosis, where homologous chromosomes pair up and exchange genetic information.

3. **Recognizing the Enzyme Involved**:
- The enzyme that facilitates the process of crossing over is known as **Recombinase**. This enzyme plays a vital role in the recombination of genetic material, ensuring that the segments of DNA are exchanged correctly between the chromatids.

4. **Conclusion**:
- Therefore, the enzyme required for crossing over is **Recombinase**.