AP BIOLOGY

Detailed explanation-1: -Cells typically enter the G0 phase after they finish mitosis. They have no need to divide again. Sometimes, however, they may enter into the G0 phase from G1 because their environments lack the necessary nutrients with which to enter the nutrient-expensive cell cycle.

Detailed explanation-2: -Cells in the G0 phase are not actively preparing to divide. The cell is in a quiescent (inactive) stage that occurs when cells exit the cell cycle. Some cells enter G0 temporarily until an external signal triggers the onset of G1. No more DNA replication or cell division happens at this phase.

Detailed explanation-3: -If all is not ready to undergo DNA replication, cells can pause during G1 and enter a phase called G0.

Detailed explanation-4: -G0 phase is also called as interphase which is the resting phase. G1 phase which is the first growth phase is the first phase of the cell cycle.