Cell Cycle - Medical Science

Q1:

At which of the following check point, mitosis is controlled?

A G1

B G2

C M

D S

ANS:B - G2

What is mitosis is controlled? Not clear.

In G2 if all enzymes/necessary proteins are available and before mitosis starts.

In M: when all spindles are attached to the kinetochore anaphase can start.