The replication of DNA takes place during:

Options

A. `G_(1)` stage
B. `G_(2)` stage
C. S stage
D. mitotic stage

Answer

To answer the question "The replication of DNA takes place during:", we need to identify the specific phase of the cell cycle where DNA replication occurs. Here’s a step-by-step breakdown of the solution:

### Step-by-Step Solution:

1. **Understanding the Cell Cycle**: The cell cycle consists of several phases: G1 (Gap 1), S (Synthesis), G2 (Gap 2), and M (Mitosis). Each phase has specific functions related to cell growth and division.

2. **Identifying DNA Replication**: DNA replication is the process by which a cell makes a copy of its DNA. This is crucial for cell division, as each daughter cell needs to have the same genetic material.

3. **Locating the S Phase**: The S phase of the cell cycle is specifically designated for DNA synthesis. During this phase, the cell replicates its DNA so that each new cell will have a complete set of chromosomes.

4. **Differentiating Other Phases**:
- In the G1 phase, the cell grows and prepares for DNA synthesis but does not replicate DNA.
- In the G2 phase, the cell prepares for mitosis but again does not replicate DNA.
- The M phase is where actual cell division occurs, but the DNA has already been replicated in the S phase.

5. **Conclusion**: Therefore, the replication of DNA takes place during the S phase of the cell cycle.

### Final Answer:
The replication of DNA takes place during the S phase of the cell cycle.

---