Which among the following has 23 chromosomes?

Options

A. Spermatogonia
B. Zygote
C. Secondary oocyte
D. Oogonia

Answer

To solve the question "Which among the following has 23 chromosomes?" we need to analyze each of the given options in terms of their chromosome number.

### Step-by-Step Solution:

1. **Understanding Chromosome Numbers**:
- Humans have a total of 46 chromosomes, organized into 23 pairs.
- The term "haploid" (N) refers to cells that have half the total number of chromosomes, which is 23 in humans.
- The term "diploid" (2N) refers to cells that have the full set of chromosomes, which is 46 in humans.

2. **Analyzing Each Option**:
- **Option 1: Spermatogonia**:
- Spermatogonia are the precursor cells to sperm and are diploid (2N).
- Therefore, they have 46 chromosomes.

- **Option 2: Zygote**:
- A zygote is formed by the fusion of two gametes (sperm and egg) and is also diploid (2N).
- Hence, it contains 46 chromosomes.

- **Option 3: Secondary Oocyte**:
- A secondary oocyte is formed from the primary oocyte through meiosis, resulting in a haploid cell (N).
- Thus, it has 23 chromosomes.

- **Option 4: Oogonia**:
- Oogonia are the precursor cells to oocytes and are diploid (2N).
- Therefore, they also have 46 chromosomes.

3. **Conclusion**:
- Among the options analyzed, only the **Secondary Oocyte** has 23 chromosomes, making it the correct answer.

### Final Answer:
The correct answer is **Secondary Oocyte**.