The critical checkpoints that control the cell cycle are at the

G_{1}

to S stage and

G_{2}

to M stage

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S to

G_{2}

stage and

G_{2}

to M stage

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M to

G_{1}

stage and

G_{2}

to M stage

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M to

G_{1}

stage and S to

G_{2}

stage

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Solution

The correct option is A $G_{1}$ to S stage and $G_{2}$ to M stage
The cell cycle is mainly under the control of two checkpoints. One during the transition from G1 to S Stage. As cell further processes into the cell cycle it faces another checkpoint when it transits between G2 to M stage.
So the correct answer is 'G1 to S stage and G2 to M stage'.

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