Which are haploid?

Options

A. Spermatogonial cells
B. Germinal epithelial cells
C. Secondary spermatocytes
D. Prmary spermatocytes.

Answer

To determine which cells are haploid among the given options, we need to understand the nature of each cell type mentioned in the question.

### Step-by-Step Solution:

1. **Understanding Haploid and Diploid**:
- Haploid cells contain one set of chromosomes (n), while diploid cells contain two sets (2n). In humans, haploid cells are typically gametes (sperm and eggs), whereas diploid cells are somatic cells.

2. **Analyzing the Options**:
- **A. Spermatogonial cells**: These are diploid (2n) cells found in the testes that undergo mitosis to produce primary spermatocytes.
- **B. Germinal epithelial cells**: These are also diploid (2n) cells that give rise to spermatogonial cells.
- **C. Spermatocytes**: This term generally refers to both primary and secondary spermatocytes. However, primary spermatocytes are diploid (2n), while secondary spermatocytes are haploid (n).
- **D. Primary spermatocytes**: These are diploid (2n) cells that undergo meiosis to form secondary spermatocytes.

3. **Identifying the Haploid Cells**:
- From the analysis, the only haploid cells in the options provided are the **secondary spermatocytes** (which are not explicitly listed but are included under the term "spermatocytes"). Therefore, the correct answer is option C, as it refers to the secondary spermatocytes.

### Final Answer:
The haploid cells among the options provided are **C. Spermatocytes** (specifically referring to secondary spermatocytes).

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