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University of Wisconsin
The Why Files: Scottish Sheep Shocker! New Pair of Genes
This article provides a discussion of DNA and how it replicates. Includes a chromosome map of a human male, a close-up of chromosomes just before cell division and a close up of a DNA molecule.
Sumanas
Sumanas Inc: Life: The Science of Biology: The Meselson Stahl Experiment
Follow Meselson and Stahl through their experiments to determine how DNA replicates.