When does DNA replication occur?

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DNA replication occurs during the S phase of the cell cycle. The cell cycle is divided into several phases, and DNA replication specifically takes place during the synthesis phase (S phase), which is between the G1 phase (gap 1) and the G2 phase (gap 2). During this time, the DNA in the cell’s nucleus is copied so that each new cell will have an identical set of genetic information after cell division.

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