Formation of primary spermatocyte/ oocyte from a spermatogonium/oogonium requires

Options

A. Mitosis
B. Melosis I
C. Meiosis II
D. Growth.

Answer

To answer the question regarding the formation of primary spermatocytes or oocytes from spermatogonia or oogonia, we can break down the process step by step:

### Step-by-Step Solution:

1. **Understanding the Germ Cells**:
- Spermatogonia are the immature male germ cells found in the testes, while oogonia are the immature female germ cells found in the ovaries.

2. **Process of Spermatogenesis and Oogenesis**:
- Both spermatogenesis (formation of sperm) and oogenesis (formation of eggs) involve a series of developmental stages.

3. **Mitosis in Germ Cells**:
- Spermatogonia undergo mitosis to increase their numbers. This is the first step in both spermatogenesis and oogenesis, where the germ cells multiply.

4. **Formation of Primary Spermatocytes and Oocytes**:
- After several rounds of mitotic division, some spermatogonia differentiate into primary spermatocytes, while oogonia differentiate into primary oocytes. This differentiation requires growth and maturation of the cells.

5. **Role of Growth**:
- The transition from spermatogonia to primary spermatocytes and from oogonia to primary oocytes is primarily driven by growth. This growth phase is crucial as it prepares the cells for the subsequent meiotic divisions.

6. **Conclusion**:
- Therefore, the formation of primary spermatocytes from spermatogonia and primary oocytes from oogonia requires growth.

### Final Answer:
- The correct answer is **D) Growth**.