DNA is like the instruction manual for building and operating a cell. DNA replication needs to occur because existing cells divide to produce new cells. Each cell needs a full instruction manual to operate properly. So the DNA needs to be copied before cell division so that each new cell receives a full set of instructions! Here is a video which uses an animated tutorial to explain the process of . I’d also recommend visiting the following sites which give a nice overview of the process of replication and why it needs to happen. Lew Port – DNA Replication Lew Port – Cell Division Hope this helps!
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