Spermatogenesis involves

Options

A. Mitosis
B. Meiosis
C. Both A and B
D. Metamorphosis

Answer

**Step-by-Step Solution:**

1. **Understanding Spermatogenesis**: Spermatogenesis is the process of sperm cell development in males. It begins with primordial germ cells, known as spermatogonia.

2. **Role of Spermatogonia**: Spermatogonia are diploid cells (2n), meaning they have two sets of chromosomes. They undergo mitosis to produce more spermatogonia, maintaining the diploid chromosome number.

3. **Meiosis in Spermatogenesis**: Some spermatogonia differentiate into primary spermatocytes, which are also diploid. These primary spermatocytes undergo meiosis, a two-step division process that reduces the chromosome number by half, resulting in haploid cells.

4. **First Meiotic Division**: The first meiotic division of a primary spermatocyte produces two secondary spermatocytes, each with half the number of chromosomes (haploid, n).

5. **Second Meiotic Division**: Each secondary spermatocyte undergoes a second meiotic division, resulting in a total of four haploid spermatids.

6. **Spermiogenesis**: The spermatids then undergo a process called spermiogenesis, where they differentiate into mature sperm cells (spermatozoa), which are motile.

7. **Conclusion**: Since spermatogenesis involves both mitosis (for the initial proliferation of spermatogonia) and meiosis (for the reduction of chromosome number), the correct answer is that spermatogenesis involves both A (mitosis) and B (meiosis).

**Final Answer**: Option 3: Both A and B.

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