Identify where there are checkpoints within the cell cycle to help control cellular division. Indicate the question asked and how each stops the progression of cell division.
a) G1 checkpoint: Is the cell size adequate? - Halts division if conditions aren't met.
b) G2 checkpoint: Has DNA replicated properly? - Stops division if DNA is damaged.
c) M checkpoint: Are all chromosomes properly attached to the spindle? - Prevents uneven chromosome separation.
d) All of the above