Question

1. the checkpoint that occurs before mitosis is: g1 s g2 m

Explanation:

The cell cycle has checkpoints. The G2 checkpoint occurs before mitosis (M phase) to ensure DNA replication in S phase is correct and cell is ready for division. G1 is before S, S is for replication, M is mitosis. So the checkpoint before mitosis is G2.

Answer:

G2 (the option labeled "G2")