DNA replication occurs during which part of cell cycle?

Options

A. G, phase
B. S-phase
C. G, phase
D. Dividing phase

Answer

**Step-by-Step Solution:**

1. **Understanding the Cell Cycle**: The cell cycle consists of several phases, primarily divided into Interphase (G1, S, G2) and the Mitotic phase (M phase). Interphase is where the cell prepares for division, while the M phase is where the actual division occurs.

2. **Identifying the Phases**:
- **G1 Phase**: This is the first gap phase where the cell grows and synthesizes proteins necessary for DNA replication.
- **S Phase**: This is the synthesis phase where DNA replication occurs. During this phase, each chromosome is replicated to form sister chromatids.
- **G2 Phase**: This is the second gap phase where the cell continues to grow and prepares for mitosis. It also involves checking the DNA for any damage and ensuring that replication has occurred correctly.

3. **Conclusion**: DNA replication specifically occurs during the **S phase** of the cell cycle. This is the critical phase where the genetic material is duplicated, ensuring that each daughter cell will receive an identical set of chromosomes.

4. **Final Answer**: DNA replication occurs during the **S phase** of the cell cycle.

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