Which of the following will undergo meiosis and mitosis both ?

Options

A. Oocytes
B. Spermatids
C. Interstitial cells
D. Gonads

Answer

To determine which of the following undergoes both meiosis and mitosis, let's analyze each option step by step.

### Step 1: Understanding Meiosis and Mitosis
- **Meiosis** is a type of cell division that reduces the chromosome number by half, resulting in four haploid daughter cells. It occurs in the formation of gametes (sperm and eggs).
- **Mitosis** is a type of cell division that results in two identical diploid daughter cells, maintaining the same chromosome number as the parent cell. It occurs in somatic (body) cells.

### Step 2: Analyzing the Options
1. **Oocytes**:
- Oocytes are involved in the formation of eggs and undergo meiosis (specifically, oogenesis) but do not undergo mitosis after they are formed.
- **Conclusion**: Oocytes only undergo meiosis.

2. **Spermatids**:
- Spermatids are the result of meiosis and do not undergo further cell division. They mature into sperm but do not divide by mitosis.
- **Conclusion**: Spermatids do not undergo mitosis.

3. **Interstitial Cells**:
- Interstitial cells (such as Leydig cells in the testes) produce hormones like testosterone but do not undergo meiosis or mitosis in the context of gamete formation.
- **Conclusion**: Interstitial cells do not undergo meiosis or mitosis related to gametes.

4. **Gonads**:
- Gonads (testes in males and ovaries in females) are the organs where both meiosis and mitosis occur.
- In males, spermatogonia undergo mitosis to produce primary spermatocytes, which then undergo meiosis to produce sperm.
- In females, oogonia undergo mitosis to produce primary oocytes, which then undergo meiosis to produce eggs.
- **Conclusion**: Gonads undergo both meiosis and mitosis.

### Final Answer
The correct answer is **Option 4: Gonads**.

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