What would happen if cyclin was injected into a cell that was in mitosis?

Cyclin is the group of proteins that manage the succession of the cells through the cell cycle. So when a cell is injected with Cyclin during the process of mitosis then the cell would move fast along the cell cycle when compared to the cell that were not injected with Cyclin.

If you remove all the lions from the savanna it will lead to a increase of gazelle and a increase of cheetahs becasue of no competition