Answer :
If a cell underwent mitosis, and its daughter cells were exposed to chemicals that damaged DNA, then the stage of cell cycle checkpoint at which the cell would arrest would be G1 stage of the interphase.
What do you mean by interphase?
The cell cycle is composed of two phases: interphase and the cell division phase.
The interphase takes place before cell division and it is the stage during which the cell prepares to divide, which means its content must be in the proper proportion to produce daughter cells with same intracellular content. Interphase is composed of G1, S, and G2 stages.
Cell undergoes division, after the interphase. When the cell ends its division, then the produced daughter cells immediately begin the process again starting with interphase.
To know more about interphase, refer
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