## **Core Concept**
The cell cycle is the series of events that take place in a cell, leading to its division and duplication. It consists of two main phases: interphase and the mitotic (or division) phase. Interphase is further divided into three stages: G1 (gap 1), S (synthesis), and G2 (gap 2).

## **Why the Correct Answer is Right**
The correct sequence of the cell cycle is: G1 (gap 1) → S (synthesis) → G2 (gap 2) → M (mitosis). During G1, the cell grows and prepares for DNA replication. The S phase is where DNA synthesis occurs, and the genetic material is duplicated. The G2 phase is a period of rapid cell growth and protein synthesis, during which the cell prepares for mitosis. Mitosis is the division of the cell's nucleus into two daughter nuclei, each with the same number and kind of chromosomes as the parent nucleus.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option does not accurately depict the cell cycle sequence. Without the specific sequence provided, we can infer it's incorrect based on the correct sequence being G1 → S → G2 → M.
- **Option B:** Similarly, this option is incorrect as it does not align with the established cell cycle sequence of G1 → S → G2 → M.
- **Option D:** This option is also incorrect for the same reason; it does not correctly represent the cell cycle sequence.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the cell cycle can be regulated at various checkpoints, notably the G1/S checkpoint, the G2/M checkpoint, and the metaphase checkpoint. These checkpoints ensure that a cell is ready to proceed to the next stage of the cycle, preventing damaged cells from dividing.

## **Correct Answer:** . G1 → S → G2 → M