In `G_(2)`-phase, DNA content is

Options

A. 2n
B. n
C. 3n
D. 4n

Answer

To determine the DNA content in the G2 phase of the cell cycle, we can follow these steps:

### Step-by-Step Solution:

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

2. **Identifying the G1 Phase**:
- In the G1 phase, the cell is diploid (2N) and is preparing for DNA synthesis. Here, the cell grows and synthesizes proteins but does not replicate its DNA.

3. **Understanding the S Phase**:
- In the S phase, DNA replication occurs. The diploid (2N) DNA content is replicated, resulting in a tetraploid (4N) state because the amount of DNA doubles.

4. **Analyzing the G2 Phase**:
- After the S phase, the cell enters the G2 phase. In this phase, the DNA has already been duplicated during the S phase.
- Therefore, the DNA content remains at tetraploid (4N) in the G2 phase as the cell prepares for mitosis.

5. **Conclusion**:
- In the G2 phase, the DNA content is tetraploid (4N).

### Final Answer:
- The DNA content in the G2 phase is **tetraploid (4N)**.

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