The sequence of cell cycle is :

Options

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

Answer

### Step-by-Step Solution:

1. **Understanding the Cell Cycle**: The cell cycle is a series of events that occur in a cell as it grows and divides. It consists of phases that repeat cyclically.

2. **Phases of the Cell Cycle**: The cell cycle is divided into two main parts:
- **Preparation Phase**: This is the longer phase, accounting for about 95% of the cell cycle.
- **M Phase (Mitotic Phase)**: This is the shorter phase, making up about 5% of the cell cycle.

3. **Sub-phases of the Preparation Phase**:
- **G1 Phase (Gap 1)**: During this phase, the cell grows, synthesizes proteins, and generates ATP molecules.
- **S Phase (Synthesis)**: In this phase, DNA is synthesized. The proteins and energy required for DNA synthesis are prepared during the G1 phase.
- **G2 Phase (Gap 2)**: This phase involves further growth and the synthesis of proteins needed for the M phase.

4. **M Phase**: The M phase consists of two main processes:
- **Karyokinesis**: This is the division of the nucleus.
- **Cytokinesis**: This is the division of the cytoplasm.

5. **Correct Sequence of the Cell Cycle**: Putting all the phases together, the correct sequence of the cell cycle is:
- **G1 → S → G2 → M Phase (which includes Karyokinesis and Cytokinesis)**.

### Final Answer:
The correct sequence of the cell cycle is **G1, S, G2, M Phase**.

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