What is the correct sequence of sperm formation?

Options

A. Spermatogonia, spermatozoa, spermatocyte, spermatid
B. spermatogonia, spermatocyte, spermatid, spermatozoa
C. spermatid, spermatocyte, spermatogonia, Spermatozoa
D. spermatogonia, spermatocyte, spermatozoa, spermatid

Answer

To determine the correct sequence of sperm formation, we need to understand the process of spermatogenesis, which occurs in the seminiferous tubules of the testes. Here’s the step-by-step breakdown of the process:

### Step-by-Step Solution:

1. **Start with Spermatogonia**: The process begins with primordial germ cells that develop into spermatogonia. These are the initial cells involved in sperm formation.

2. **Mitosis of Spermatogonia**: Spermatogonia undergo several rounds of mitotic division. This results in the formation of primary spermatocytes.

3. **Formation of Primary Spermatocytes**: After mitosis, the spermatogonia develop into primary spermatocytes. Each primary spermatocyte is diploid (2n).

4. **Meiosis I - Formation of Secondary Spermatocytes**: The primary spermatocytes undergo meiosis I, which results in two haploid (n) secondary spermatocytes.

5. **Meiosis II - Formation of Spermatids**: Each secondary spermatocyte then undergoes meiosis II, resulting in a total of four haploid spermatids.

6. **Transformation into Spermatozoa**: Finally, the spermatids undergo a transformation process called spermiogenesis, where they mature into spermatozoa (sperm).

### Correct Sequence:
Thus, the correct sequence of sperm formation is:
- **Spermatogonia → Primary Spermatocytes → Secondary Spermatocytes → Spermatids → Spermatozoa**

### Conclusion:
The correct answer to the question is **Option B**: Spermatogonia followed by spermatocyte, spermatid, spermatozoa.

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