Four phases of cell cycle in sequence are

G_{1} \to S \to G_{2} \to M

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S \to G_{1} \to G_{2} \to M

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G_{1} \to G_{2} \to S \to M

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M \to G_{1} \to G_{2} \to S .

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Solution

The correct option is A $G_{1} \to S \to G_{2} \to M$
A typical eukaryotic somatic cell has two main stages: a long undividing state called interphase and a shorter phase of nuclear division termed M phase or mitotic phase.
Interphase is further divided into three periods: First gap or G $_{1}$ phase, synthetic phase or S phase and second gap or G $_{2}$ phase.
1. G $_{1}$ phase: It is a stage of inital growth of a newly formed cell.
2. S phase: It is a stage of replication of each chromosome by synthesis of a new DNA molecule on the template of the exisiting DNA.
3. G $_{2}$ phase: It is a stage of further growth of the cell and preparation for its division.
4. M phase: It follows the interphase. It is aimed at orderly distribution of the already duplicated chromosomes among the two daughter nucleus.
So, the correct answer is 'G $_{1}$ $\to$ S $\to$ G $_{2}$ $\to$ M'.

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