What is the correct sequence of sperm formation?

Options

A. Spermatogonia, spermatozoa, sper- . matocyte, spermatid
B. Spermatogonia, spermatocyte, sper- matid, spermatozoa
C. Spermatid, spermatocyte, sper- matogonia. spermatozoa
D. Spermatogonia, spermatocyte, sper- matozoa, spermatid

Answer

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

### Step-by-Step Solution:

1. **Primordial Germ Cells**: The process begins with primordial germ cells, which are the initial cells that will develop into sperm.

2. **Spermatogonia Formation**: These primordial germ cells differentiate into spermatogonia. Spermatogonia are diploid cells (2n) that serve as the starting point for sperm production.

3. **Mitosis to Primary Spermatocytes**: Spermatogonia undergo mitotic division to produce primary spermatocytes. Since this is a mitotic division, the chromosome number remains the same (diploid).

4. **Meiosis to Secondary Spermatocytes**: Each primary spermatocyte then undergoes meiosis I, resulting in two secondary spermatocytes. At this stage, the chromosome number is halved (haploid, n).

5. **Meiosis to Spermatids**: Each secondary spermatocyte undergoes meiosis II, resulting in a total of four spermatids from the original primary spermatocyte. Spermatids are also haploid.

6. **Spermatids to Spermatozoa**: Finally, spermatids undergo a process of maturation and differentiation to become spermatozoa (sperm cells).

### Correct Sequence:
The correct sequence of sperm formation is:
- Spermatogonia → Primary Spermatocyte → Secondary Spermatocyte → Spermatid → Spermatozoa

### Conclusion:
Based on the analysis, the correct answer from the given options is:
**Spermatogonia followed by Spermatocyte, Spermatid, and Spermatozoa.**

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