In which phase of interphase centriole duplicates in cytoplasm?

Options

A. `G_(1)` -phase
B. S-phase
C. `G_(2)` -phase
D. M - phase

Answer

To answer the question "In which phase of interphase does centriole duplicate in the cytoplasm?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand Interphase**: Interphase consists of three phases: G1 (Gap 1), S (Synthesis), and G2 (Gap 2). Each phase has specific activities that prepare the cell for division.

2. **Analyze G1 Phase**: In the G1 phase, the cell is metabolically active and focuses on synthesizing proteins and growing. There is no duplication of centrioles during this phase.

3. **Examine S Phase**: The S phase is known as the Synthesis phase. During this phase, DNA replication occurs, and importantly, centrioles also duplicate in the cytoplasm. This is the correct answer to the question.

4. **Look at G2 Phase**: In the G2 phase, the cell continues to grow and prepares for mitosis (M phase). It synthesizes proteins and enzymes but does not duplicate centrioles.

5. **Consider M Phase**: The M phase is when cell division occurs. By this time, the centrioles have already been duplicated in the S phase, so no duplication occurs during M phase.

6. **Conclusion**: The correct answer is the S phase, as this is when centriole duplication occurs in the cytoplasm.

### Final Answer:
The centriole duplicates in the cytoplasm during the **S phase** of interphase.

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