Which of the following cell undergoes first meiotic division during spermatogenesis?

Options

A. Spermatogonium
B. Primary spermatocyte
C. Secondary spermatocyte
D. Spermatid

Answer

To solve the question "Which of the following cell undergoes first meiotic division during spermatogenesis?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand Spermatogenesis**:
- Spermatogenesis is the process of sperm formation that occurs in the seminiferous tubules of the testes.

2. **Identify the Initial Cell Type**:
- The process begins with spermatogonia, which are the male germ cells. These cells are diploid (2n), meaning they have two sets of chromosomes.

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 meiosis.

4. **Formation of Primary Spermatocyte**:
- The primary spermatocyte is also diploid (2n) and is the cell that will undergo the first meiotic division.

5. **First Meiotic Division**:
- The primary spermatocyte undergoes the first meiotic division (meiosis I), resulting in the formation of secondary spermatocytes. This is where the reduction in chromosome number occurs.

6. **Understanding Secondary Spermatocyte**:
- The secondary spermatocytes are haploid (n), containing half the number of chromosomes compared to the primary spermatocyte.

7. **Conclusion**:
- The question specifically asks for the cell that undergoes the first meiotic division. The primary spermatocyte is the correct answer, as it is the one that undergoes meiosis I.

### Final Answer:
The cell that undergoes the first meiotic division during spermatogenesis is the **primary spermatocyte**.