DNA replication is happening continuously throughout the body, as many as trillions of times per day. Whenever a cell divides—whether to repair damaged tissue, replace old cells, or simply to help the body grow—DNA is copied to ensure the new cells carry the same genetic instructions. DNA replication is happening continuously throughout the body, as many as trillions of times per day. Whenever a cell divides—whether to repair damaged tissue, replace old cells, or simply to help the body grow—DNA is copied to ensure the new cells carry the same genetic instructions. Cell & Microbiology Molecular & Computational biology Phys.org – latest science and technology news stories