DNA replication occurs in the S phase of the cell cycle. DNA replication is the process where DNA copies itself. This happens so that old cells can make new cells.

The whole process of DNA replication, in human cells, takes about eight hours. There is still plenty to be worked out. For one thing, the DNA that’s being copied is not a naked double helix.

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Stress and trauma can change your DNA — and the DNA of your kids and grandkids By . Tracy Swartz. Published March 19, 2025, 2:46 p.m. ET.

Revise the structure and replication of DNA for your Higher biology exam with Bitesize Scotland interactive practice quizzes covering feedback and common errors. BBC Homepage.