During spermatogenesis , secondary spermatocytes are result of

Options

A. Mitosis
B. Meiosis -I
C. Meiosis -II
D. Growth

Answer

To solve the question regarding the production of secondary spermatocytes during spermatogenesis, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding Spermatogenesis**:
- Spermatogenesis is the process by which male gametes (sperms) are produced in the seminiferous tubules of the testes.

2. **Starting Cells**:
- The process begins with spermatogonia, which are the immature germ cells.

3. **Mitosis of Spermatogonia**:
- Spermatogonia undergo mitotic division to produce primary spermatocytes. This step is crucial as it increases the number of cells that can undergo further development.

4. **Meiosis of Primary Spermatocytes**:
- Primary spermatocytes then undergo the first meiotic division (meiosis I). This division is a reductional division, meaning it reduces the chromosome number by half.

5. **Formation of Secondary Spermatocytes**:
- The result of meiosis I is the formation of secondary spermatocytes. Each primary spermatocyte divides into two secondary spermatocytes, each containing half the number of chromosomes (23 in humans).

6. **Further Development**:
- Secondary spermatocytes will then undergo meiosis II to form spermatids, but the question specifically asks about the formation of secondary spermatocytes.

### Conclusion:
- Therefore, secondary spermatocytes are produced as a result of **meiosis I** of primary spermatocytes.

### Final Answer:
- The correct answer is **meiosis I**.

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