Number of secondary spermatocytes required to produce 200 spermatozoa are:

Options

A. 50
B. 100
C. 150
D. 200

Answer

To solve the problem 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 formation, which involves several stages: spermatogonia, primary spermatocytes, secondary spermatocytes, and spermatids (spermatozoa).

2. **Identifying the Stages**:
- **Spermatogonia** (2n): These are the diploid mother cells.
- **Primary Spermatocytes** (2n): These are formed from spermatogonia through mitosis.
- **Secondary Spermatocytes** (n): These are formed from primary spermatocytes through meiosis I.
- **Spermatids/Spermatozoa** (n): These are formed from secondary spermatocytes through meiosis II.

3. **Meiosis Process**:
- Each primary spermatocyte undergoes meiosis I to produce two secondary spermatocytes.
- Each secondary spermatocyte then undergoes meiosis II to produce two spermatids (spermatozoa).

4. **Calculating the Number of Spermatozoa**:
- If we need to produce 200 spermatozoa, we can determine how many secondary spermatocytes are required.
- Since each secondary spermatocyte produces 2 spermatozoa, we can set up the equation:
\[ \text{Number of secondary spermatocytes} \times 2 = 200 \]
- Rearranging gives:
\[ \text{Number of secondary spermatocytes} = \frac{200}{2} = 100 \]

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