Following upon A Little Peek Into DNA Replication, I think it proper to show what happens after it's duplicated. The video below gives a great illustration of what happens.
The video is in two parts. The second part is a time-lapse of a cell dividing into two after replicating its DNA.
While studying DNA in the 1970's, I became convinced that the chromosomes included some form of molecular scaffolding for the DNA, but we did not go into that. Fascinating how it all gets packed away so neatly and compactly.