During spermalogenesis meiosis occurs in

Options

A. Primary spermatocytes
B. Secondary spermatocytes
C. Both (1) & (2)
D. Spermatogonia

Answer

**Step-by-Step Solution:**

1. **Understanding Spermatogenesis**: Spermatogenesis is the process of sperm cell development which occurs in the male reproductive system.

2. **Identifying the Starting Point**: The process begins with spermatogonia, which are diploid cells (2n). These cells undergo mitosis to produce primary spermatocytes.

3. **Meiosis in Primary Spermatocytes**: The primary spermatocytes (also diploid) undergo the first meiotic division (Meiosis I) to form secondary spermatocytes. This is the first instance of meiosis occurring during spermatogenesis.

4. **Meiosis in Secondary Spermatocytes**: The secondary spermatocytes (haploid, n) then undergo the second meiotic division (Meiosis II) to produce spermatids. This is the second instance of meiosis occurring.

5. **Conclusion**: Therefore, meiosis occurs in both primary spermatocytes and secondary spermatocytes. The spermatogonia do not undergo meiosis; they only undergo mitosis.

6. **Final Answer**: Based on the above reasoning, the correct answer to the question is option **C: Both 1 and 2** (primary and secondary spermatocytes).

---