cells will usually divide if they receive the proper signal at a checkpoint in which phase of the cell cycle?

Cells will usually divide if they receive the proper signal at the checkpoint in the G1 phase of the cell cycle.

Key idea

• The G1 checkpoint (also called the restriction or Start checkpoint) is the main “decision point” where a cell commits to divide if conditions and signals are right.

• Once a cell passes this G1 checkpoint after receiving proper growth signals, it is usually committed to complete the rest of the cycle and undergo division.

Answer: G1 phase.