During the cell cycle, the cell divides its nucleus and chromosomes during

during the mitotic phase

Telophase/Cytokineses

Explanation:

This is the final stage of the cell cycle, so it makes sense that everything will be wrapped up and the cell will divide, as is the purpose of the cell cycle.  The chromosomes have already been pulled to the poles of the cell in anaphase, so in telophase the two cells can form with enough chromosomes each.

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