One example of an oncogene is ras. Ras is a G protein that is activated when growth factors bind to a G protein-coupled receptor. The mutated form of ras binds to GTP but does not allow the GTP to be broken down to GDP. Ras is involved in both the G1 and G2 checkpoints.
What happens to cells that have this mutated form of ras?
They divide when they should not.
They don't divide when they should.
They enter mitosis without going through the S phase of the cell cycle.
They enter cytokinesis without going through the M phase of the cell cycle.