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  4. During which phase of cell cycle DNA duplication occurs?

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Q. During which phase of cell cycle DNA duplication occurs?

UP CPMTUP CPMT 2010Cell Cycle and Cell Division

Solution:

$S$ or synthesis phase marks the period during which $DNA$ synthesis or replication takes place. During this time the amount of $DNA$ per cell doubles. If the initial amount of $DNA$ is denoted as $2C$ then it increases to $4C$. However, there is no increase in the chromosome number; if the cell had diploid or $2n$ number of chromosomes at $G_1$, even after $S$ phase the number of chromosomes remains the same i.e., $2n$.