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What is During which phase of the cell cycle the cellular content of DNA is doubled - and explain in detail?
There are two resting phases and two active phases in the cycle.
Resting phases → G1 & G2
Active phases


S-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.