During spermatogensis, second meietic division occurs during

Options

A. Spermatogonia A `to` Spermatogonia B
B. Primary spermatocyte `to` Secondary spermatocyte
C. Spermatogonia B `to` Primary spermatocyte
D. Secondary spermatocyte `to` Spermatid

Answer

### Step-by-Step Solution:

1. **Understanding Spermatogenesis**:
- Spermatogenesis is the process of male gamete (sperm) formation. It involves several stages, including the differentiation of spermatogonia into spermatids.

2. **Identifying the Meiotic Divisions**:
- During spermatogenesis, there are two meiotic divisions:
- The **first meiotic division** occurs when a primary spermatocyte (diploid) divides to form two secondary spermatocytes (haploid).
- The **second meiotic division** occurs when each secondary spermatocyte (haploid) divides to form two spermatids (haploid).

3. **Locating the Second Meiotic Division**:
- The second meiotic division specifically occurs during the conversion of secondary spermatocytes into spermatids. This means that the secondary spermatocyte undergoes meiosis II to produce spermatids.

4. **Evaluating the Options**:
- **Option 1**: Spermatogonia type A to Spermatogonia type B - This is mitosis, not meiosis.
- **Option 2**: Primary spermatocyte to secondary spermatocyte - This is the first meiotic division.
- **Option 3**: Spermatogonia type B to primary spermatocyte - This is also mitosis.
- **Option 4**: Secondary spermatocyte to spermatid - This is the correct identification of the second meiotic division.

5. **Conclusion**:
- The second meiotic division occurs when secondary spermatocytes convert into spermatids. Therefore, the correct answer is **Option 4**.