<prompt> During which phase of the cell cycle the cellular content of DNA is doubled -Mitotic phaseG1 phaseG2 phaseS phase  <response>: There are two resting phases and two active phases in the cycle.Resting phases G1 G2Active phasesS-phase synthetic phase - As the name suggests, synthesis of new DNA takes place, i.e. doubling of DNA occurs.M-phase mitotic phase - Mitosis takes place and the daughter cells receive one copy of DNA. In this phase, cell number is doubled. 