Why must a cell that needs to divide follow the sequence of the events of the cell cycle (G1-S-G2-M-C)? If the sequence were changed or a stage skipped, the cell would turn into a different kind of cell.
If the sequence were changed or a stage skipped, the cell would quickly die due to the toxins created.
If the sequence were changed or a stage skipped, the cell would divide uncontrollably.
If the sequence were changed or a stage skipped, the cell would lack the material and energy to divide.