Primary spermatocyte differs from spermatogonium in

Options

A. Number of chromosomes
B. size and volume
C. DNA content
D. Size of chromosomes

Explanation

To understand how primary spermatocytes differ from spermatogonia, we can break down the differences step by step:

### Step-by-Step Solution:

1. **Definition of Spermatogonium**:
- Spermatogonia are the germ cells that are the precursors to sperm cells. They are diploid (2n) cells, meaning they contain two sets of chromosomes.

2. **Process of Development**:
- Spermatogonia undergo mitotic division. During this process, one of the resulting cells grows larger and becomes a primary spermatocyte.

3. **Definition of Primary Spermatocyte**:
- A primary spermatocyte is also a diploid (2n) cell, similar to spermatogonia. However, it is the first stage in the process of meiosis, where it will eventually divide to form haploid spermatids.

4. **Comparison of Size**:
- The primary spermatocyte is larger than the spermatogonium. This increase in size occurs because the primary spermatocyte absorbs more nutrients and grows in volume.

5. **Chromosome Number**:
- Both spermatogonia and primary spermatocytes have the same number of chromosomes (2n), so this is not a distinguishing factor.

6. **DNA Content**:
- The DNA content remains the same between spermatogonia and primary spermatocytes, as both are diploid.

7. **Conclusion**:
- The primary difference between a primary spermatocyte and a spermatogonium is the size and volume. The primary spermatocyte is larger due to nutrient absorption and growth.

### Final Answer:
Primary spermatocyte differs from spermatogonium in size and volume.

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