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University of Washington
Uwmc Cytogenetics Laboratory: Cytogenetics Gallery
This site opens with an excellent introduction to Cytogenetics. Explore this site to learn about chromosomes, human karyotypes and more.
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.
Cold Spring Harbor Laboratory
Dolan Dna Learning Center: How Alu Jumps
Animation illustrating how the jumping gene, Alu, reproduces by copying itself and inserting into new chromosomes.
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