The cell has four main stages-G,S,G and M what occurs in the cell during each stage?

Question

High school Biology section 5 review 

Answer 1

During the G₁ stage the cell performs its normal functions and grows, pretty much doubling the number of organelles and its size.  During the S stage its DNA replicates.  During the G₂ stage it makes any last minute repairs in preparation for cell division.  During the M stage it separates the sister chromatids (mitosis) and divides.