During spermatogenesis, the first meotic division occurs in

Options

A. Sertoli cells
B. Spermatids
C. Spermatozoans
D. Primary spermatocytes

Answer

**Step-by-Step Solution:**

1. **Understanding Spermatogenesis**: Spermatogenesis is the process of sperm cell development, which occurs in the seminiferous tubules of the testes.

2. **Identifying the Starting Cell**: The process begins with spermatogonia, which are diploid cells (2n) containing 46 chromosomes.

3. **Mitosis of Spermatogonia**: Spermatogonia undergo mitotic divisions to increase their number. This step does not involve meiosis.

4. **Formation of Primary Spermatocytes**: After several mitotic divisions, spermatogonia differentiate into primary spermatocytes. Each primary spermatocyte is still diploid (2n) and contains 46 chromosomes.

5. **First Meiotic Division**: The first meiotic division occurs in the primary spermatocytes. During this division, each primary spermatocyte divides to form two secondary spermatocytes, which are haploid (n) and contain 23 chromosomes.

6. **Conclusion**: Therefore, the first meiotic division during spermatogenesis occurs in the primary spermatocytes.

**Final Answer**: The first meiotic division occurs in **primary spermatocytes** (Option D).

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