Which of the following is the correct Statement about spermatogenesis ?

Options

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

Answer

To determine the correct statement about spermatogenesis, let's analyze each option provided in the question step by step.

### Step 1: Understand the process of spermatogenesis.
Spermatogenesis is the process through which male gametes (sperm) are produced in the testes. It involves several stages, starting from spermatogonia and leading to mature spermatozoa.

### Step 2: Analyze the options.
1. **Spermatogenesis has 46 chromosomes and all these undergo meiotic cell division.**
- **Analysis:** Spermatogonia (the initial cells) indeed have 46 chromosomes (diploid). However, not all stages undergo meiotic division; only the primary spermatocytes undergo meiosis. This statement is incorrect.

2. **Primary spermatocytes divide by mitosis.**
- **Analysis:** Primary spermatocytes do not divide by mitosis; they undergo meiosis to form secondary spermatocytes. This statement is incorrect.

3. **Secondary spermatocytes have 23 chromosomes and undergo second meiotic division.**
- **Analysis:** This statement is correct. Secondary spermatocytes are haploid (23 chromosomes) and they undergo the second meiotic division to form spermatids.

4. **Spermatozoa are transformed into spermatids.**
- **Analysis:** This statement is incorrect. It is the spermatids that transform into spermatozoa, not the other way around.

### Step 3: Conclusion
Based on the analysis, the correct statement about spermatogenesis is:
**"Secondary spermatocytes have 23 chromosomes and undergo second meiotic division."**