The first three stages of the cell cycle are collectively called the "Interphase". Interphase comprises 3 stages specifically G1, S1 and G2. G1 is called the First Gap Phase, followed by S phase for synthesis and then G2 for the second gap phase. I hope this helps you.
Interphase proceeds in three stages, G1, S, and G2, preceded by the previous cycle of mitosis and cytokinesis. The cell's nuclear chromosomes are duplicated during S phase.
