How many secondary spermatocytes will form 400 spermatozoa :-

Options

A. 100
B. 400
C. 40
D. 200

Answer

To determine how many secondary spermatocytes will form 400 spermatozoa, we can follow these steps:

### Step 1: Understand the Process of Spermatogenesis
- Spermatogenesis is the process by which sperm cells are produced in the male reproductive system. It involves several stages starting from spermatogonia to spermatozoa.

### Step 2: Identify the Key Stages
- The key stages include:
1. **Spermatogonium** (diploid, 2n)
2. **Primary Spermatocyte** (diploid, 2n) - formed from spermatogonia
3. **Secondary Spermatocyte** (haploid, n) - formed from primary spermatocytes through meiosis I
4. **Spermatids** (haploid, n) - formed from secondary spermatocytes through meiosis II
5. **Spermatozoa** (haploid, n) - mature sperm cells formed from spermatids

### Step 3: Calculate the Number of Secondary Spermatocytes
- Each primary spermatocyte undergoes meiosis I to produce **2 secondary spermatocytes**.
- Each secondary spermatocyte then undergoes meiosis II to produce **2 spermatids**.
- Therefore, from one primary spermatocyte, we can ultimately produce **4 spermatozoa**.

### Step 4: Relate Spermatozoa to Secondary Spermatocytes
- If we need to produce **400 spermatozoa**, we can calculate the number of secondary spermatocytes needed:
- Since **1 secondary spermatocyte produces 2 spermatids**, and each spermatid becomes a spermatozoon, we can say:
- **2 spermatids = 2 spermatozoa** from **1 secondary spermatocyte**.
- Therefore, to produce **400 spermatozoa**, we need:
- \( \text{Number of secondary spermatocytes} = \frac{400 \text{ spermatozoa}}{2 \text{ (spermatids per secondary spermatocyte)}} = 200 \text{ secondary spermatocytes} \).

### Conclusion
- Thus, **200 secondary spermatocytes** will form **400 spermatozoa**.

### Final Answer
- The answer is **200**.

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