Number of secondary spermatocytes required to produce 200 spermatozoa are :

Options

A. 50
B. 100
C. 200
D. 400

Answer

To solve the question of how many secondary spermatocytes are required to produce 200 spermatozoa, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Spermatogenesis**:
- Spermatogenesis is the process of sperm production in males. It begins with spermatogonia, which undergo mitosis to form primary spermatocytes.

2. **Formation of Secondary Spermatocytes**:
- Each primary spermatocyte (which is diploid, 2n) undergoes meiosis I to form two secondary spermatocytes (which are haploid, n). Therefore, one primary spermatocyte produces two secondary spermatocytes.

3. **Spermatocyte to Spermatozoa Conversion**:
- Each secondary spermatocyte undergoes meiosis II to produce two spermatozoa. Thus, one secondary spermatocyte produces two spermatozoa.

4. **Calculating the Number of Secondary Spermatocytes Needed**:
- If we need to produce 200 spermatozoa, we can determine how many secondary spermatocytes are required by dividing the total number of spermatozoa by the number of spermatozoa produced by each secondary spermatocyte.
- Since each secondary spermatocyte produces 2 spermatozoa, we calculate:
\[ \text{Number of secondary spermatocytes} = \frac{\text{Total spermatozoa}}{2} = \frac{200}{2} = 100 \]

5. **Conclusion**:
- Therefore, the number of secondary spermatocytes required to produce 200 spermatozoa is **100**.