DNA is shaped like a twisted ladder inside of a cell's nucleus. When a cell replicates, DNA splits down the middle of the "rungs" of its ladder. It then makes the rest of the rungs as it splits. Basically, when DNA replicates, it takes on a "Y" shape, but in a twisted ladder form.

The further the DNA splits, the more it replicates. When it finally runs out of ladder, it simply finishes making the rest of the rungs. Viola, it's done replicating!

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