The cell is all alone ready for replication. For it to grow and repair and to duplicate.
The cell is growing and repairing
The cell stops growing and soon will begin the next phase G2.
The cell grows and repairs again.
The 1 cell will have 2 identical cells
That order of the phases are G1, S, G2, and the phase. Each all play a special roll. G1 is when it grows and repairs, S is then it stop, G2 grows and repairs again, and the M phase is the end and that 1 cell has 2 identical ones as itself.