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In a diploid cell, at which stage of cell cycle, the amount of DNA is doubled?
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S phase
S-phase is known as synthetic phase. In this stage replication of DNA takes place on the template of the existing DNA and thus the amount of DNA per cell doubles. If the initial amount of DNA is denoted as $2 \mathrm{C}$, then it increases to $4 \mathrm{C}$.
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