Mitosis is always preceded by this period during which the cell is actively synthesising proteins for cell organelles and replicating DNA. The chromosomes are invisible at this point.
Chromosomes become visible, the nuclear envelope disintegrates and nucleolus disappears
Chromosomes arrange themselves at the centre of the cell with the formation of the spindle fibres.
Spindle fibres attached to chromatids contract pulling the chromatids towards the poles of the cell
Nuclear envelope and nucleolus reform and spindle fibres disintegrate. Cell division can now commence