Which of the following cells have haploid number of chromosomes?

Options

A. `1^@` spermatocytes
B. `2^@` spermocytes
C. spermatid
D. both b and C

Answer

To determine which cells have a haploid number of chromosomes, we need to understand the process of spermatogenesis and the stages of cell division involved.

### Step-by-Step Solution:

1. **Understanding Chromosome Numbers**:
- Humans have a diploid (2n) number of chromosomes, which means they have two sets of chromosomes (one from each parent). The haploid (n) number is half of the diploid number.

2. **Identifying Cell Types**:
- In spermatogenesis, the following cell types are involved:
- **Spermatogonium**: This is the initial germ cell and is diploid (2n).
- **Primary Spermatocyte**: This cell undergoes meiosis I and is also diploid (2n).
- **Secondary Spermatocyte**: This cell is formed after meiosis I and is haploid (n).
- **Spermatids**: These are formed after meiosis II and are also haploid (n).

3. **Analyzing Each Cell Type**:
- **Spermatogonium**: Diploid (2n).
- **Primary Spermatocyte**: Diploid (2n).
- **Secondary Spermatocyte**: Haploid (n).
- **Spermatids**: Haploid (n).

4. **Conclusion**:
- The cells that have a haploid number of chromosomes are the **secondary spermatocytes** and **spermatids**.

### Final Answer:
The cells that have a haploid number of chromosomes are the **secondary spermatocytes and spermatids**.

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