The immature male germ cells undergo division to produce sperms by the process of spermatogenesis. Choose the correct one with reference to above.

Options

A. Spermatogonia have 46 chromosomes and always undergo meiotic cell division
B. Primary spermatocytes divide by mitotic cell division
C. Secondary spermatocytes have 23 chromosomes and undergo second meiotic division
D. Spermatozoa are transformed into spermatids

Answer

### Step-by-Step Solution:

1. **Understanding Spermatogenesis**:
- Spermatogenesis is the process by which immature male germ cells, known as spermatogonia, undergo division to produce mature sperm cells.

2. **Initial Division of Spermatogonia**:
- Spermatogonia undergo mitosis to produce more spermatogonia. This ensures that there are enough cells for further development.

3. **Formation of Primary Spermatocytes**:
- Some spermatogonia will undergo mitosis and develop into primary spermatocytes. These cells are diploid, meaning they have 46 chromosomes.

4. **Meiosis I**:
- Primary spermatocytes undergo meiosis I, resulting in the formation of secondary spermatocytes. This process reduces the chromosome number by half.

5. **Meiosis II**:
- Secondary spermatocytes undergo meiosis II to produce spermatids. At this stage, the cells have 23 chromosomes, making them haploid.

6. **Spermiogenesis**:
- Spermatids then undergo a transformation process called spermiogenesis, where they differentiate into mature sperm cells, also known as spermatozoa.

7. **Evaluating Statements**:
- Now, we need to evaluate the provided statements about spermatogenesis:
- **Statement 1**: "The spermatogonium have 46 chromosomes." - This is correct.
- **Statement 2**: "The primary spermatocytes divide by mitotic cell division." - This is incorrect; they divide by meiosis.
- **Statement 3**: "The secondary spermatocytes have 23 chromosomes and undergo second meiotic division." - This is correct.
- **Statement 4**: "The spermatozoa are transformed into spermatids." - This is incorrect; spermatids are transformed into spermatozoa.

8. **Conclusion**:
- The correct statement regarding spermatogenesis is Statement 3: "The secondary spermatocytes have 23 chromosomes and undergo second meiotic division."