Identify the correct sequence of the following phase during cell cycle
(I) M-phase (II) S-subphase (III) `G_(2)`-subphase (IV) `G_(1)`- Subphase

Options

A. IV,II,III,I
B. I,IV,II,III
C. IV,III,II,I
D. II,IV,III,I

Answer

To identify the correct sequence of the phases during the cell cycle, we need to understand the order in which these phases occur. The phases provided are:

1. M-phase (Mitosis)
2. S-subphase (Synthesis)
3. G2-subphase (Gap 2)
4. G1-subphase (Gap 1)

### Step-by-Step Solution:

1. **Understanding the Cell Cycle**: The cell cycle consists of two main phases: Interphase and M-phase (Mitosis). Interphase is further divided into three subphases: G1, S, and G2.

2. **Order of Phases**:
- **G1 Phase (Gap 1)**: This is the first phase of interphase where the cell grows and prepares for DNA replication.
- **S Phase (Synthesis)**: This is the second phase where DNA replication occurs, resulting in the duplication of the genetic material.
- **G2 Phase (Gap 2)**: This is the final phase of interphase where the cell continues to grow and prepares for mitosis.
- **M Phase (Mitosis)**: This is the phase where the cell divides into two daughter cells.

3. **Correct Sequence**: Based on the above understanding, the correct sequence of the phases is:
- G1 (1st)
- S (2nd)
- G2 (3rd)
- M (4th)

Thus, the correct order is G1 → S → G2 → M.

4. **Final Answer**: The correct sequence of the phases during the cell cycle is:
- (IV) G1-subphase → (II) S-subphase → (III) G2-subphase → (I) M-phase
- In numerical form, this is represented as 4 → 2 → 3 → 1.

### Conclusion:
The correct answer is **4, 2, 3, 1**.

---