Damaged DNAs have to be repaired before cells can proceed to divide mitotically so as to ensure the integrity of the resulting daughter cells.
During mitosis, the DNA of a dividing cell would have to be shared equally between the two resulting daughter cells.
With damaged DNA, the resulting daughter cells' genomes have already been compromised before they even exist and this might impact their normal existence.
Thus, the integrity of the DNA of a cell that wants to divide must be certified by the cell cycle checkpoints before active division can take place.
More on cell cycle checkpoints can be found here: https://brainly.com/question/25282664?referrer=searchResults
