During gamete formation, the enzyme recombinase participates during

Options

A. Anaphase-II
B. Prophase-I
C. Prophase-II
D. Metaphase-I

Answer

### Step-by-Step Solution:

1. **Understanding Gamete Formation**:
- Gamete formation occurs through a process called meiosis, which consists of two successive divisions: meiosis I and meiosis II.

2. **Identifying the Stages of Meiosis**:
- Meiosis I has several stages: prophase I, metaphase I, anaphase I, and telophase I.
- Prophase I is further divided into five substages: leptotene, zygotene, pachytene, diplotene, and diakinesis.

3. **Role of Enzyme Recombinase**:
- The enzyme recombinase is crucial for genetic recombination, which occurs during the formation of gametes.
- It facilitates the process of crossing over, where homologous chromosomes exchange genetic material.

4. **Locating the Specific Stage**:
- The specific stage where recombinase is active is during the pachytene stage of prophase I.
- During this stage, recombination nodules appear, which are the sites where crossing over occurs between non-sister chromatids of homologous chromosomes.

5. **Conclusion**:
- Since the question asks when the enzyme recombinase participates during gamete formation, the correct answer is **prophase I** (specifically during the pachytene stage).

6. **Final Answer**:
- The correct option is **B) Prophase I**.