What do you think would happen if a cell's DNA did not replicate correctly?

If the DNA did not replicate, daughter cells would not be formed. The reason for this can be explained by the cell cycle which has four phases: G1, S, G2 and M. The S phase is the synthesis phase where DNA is replicated, in addition to many other cellular events. If the DNA fails to replicate, the cell will not go into G2 and M(mitosis) phases. A cell that halts at the G2/M checkpoint due to replication errors will kill itself through a process called apoptosis