Final answer:
Uncontrolled cell division in cancer cells takes over the G0 phase of the cell cycle.
Step-by-step explanation:
Uncontrolled cell division, where cells refuse to die, is a characteristic feature of cancer cells. This occurs when the phase of the cell cycle called G0 is taken over. G0 phase is a quiescent stage where cells are not actively preparing to divide and can remain in this phase temporarily or permanently depending on the type of cell. However, in cancer cells, the loss of control in the mechanisms that regulate the cell cycle allows for unregulated cell division leading to the formation of tumors and cancer.