Pre - DNA synthesis phase is :-

Options

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

Answer

To determine the pre-DNA synthesis phase, we need to analyze the different phases of the cell cycle. The cell cycle consists of several phases, including G1, S, G2, and M phases.

### Step-by-Step Solution:

1. **Understanding Cell Cycle Phases**:
- The cell cycle is divided into interphase (which includes G1, S, and G2 phases) and the mitotic phase (M phase).

2. **Identifying the G1 Phase**:
- The G1 phase (Gap 1) occurs right after the previous mitotic phase (M phase). During this phase, the cell grows and synthesizes mRNA and proteins necessary for DNA synthesis. This phase is crucial for preparing the cell for DNA replication.

3. **Identifying the S Phase**:
- The S phase (Synthesis) follows the G1 phase and is characterized by the actual synthesis of DNA. This is when the cell replicates its DNA in preparation for cell division.

4. **Identifying the G2 Phase**:
- The G2 phase (Gap 2) occurs after the S phase. In this phase, the cell continues to grow and prepares for mitosis, but no DNA synthesis occurs here.

5. **Conclusion**:
- Since the question asks for the pre-DNA synthesis phase, the correct answer is the G1 phase, as it occurs before the S phase where DNA synthesis takes place.

### Final Answer:
The pre-DNA synthesis phase is the **G1 phase**.

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