Organelle duplication and DNA duplication occurs respectively in

Options

A. `G_(2)` and `G_(1)`
B. `G_(1)` and S
C. `G_(1)` and M
D. Telophase

Answer

To answer the question regarding when organelle duplication and DNA duplication occur, we can break down the cell cycle phases as follows:

### 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 specific functions related to cell growth and division.

2. **Identifying the G1 Phase**:
- In the G1 phase, the cell is metabolically active and grows in size.
- During this phase, certain organelles duplicate to prepare for cell division. However, DNA replication does not occur in this phase.

3. **Identifying the S Phase**:
- The S phase is specifically designated for DNA synthesis or replication.
- During this phase, the cell duplicates its DNA, ensuring that each daughter cell will have an identical set of chromosomes.

4. **Identifying the G2 Phase**:
- In the G2 phase, the cell continues to grow and prepares for mitosis.
- There is no additional organelle duplication or DNA replication occurring in this phase.

5. **Conclusion**:
- Based on the functions of these phases, we can conclude that organelle duplication occurs in the G1 phase, while DNA duplication occurs in the S phase.
- Therefore, the correct answer to the question is that organelle duplication occurs in G1 and DNA duplication occurs in S.

### Final Answer:
Organelle duplication occurs in the G1 phase, and DNA duplication occurs in the S phase.

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