PETER MENZEL / SCIENCE PHOTO LIBRARY PETER MENZEL / SCIENCE PHOTO LIBRARY
Research on the human genome: Caltech scientist Kai Wand loading an electrophoresis gel into a computer-controlled system used for DNA sequencing of human chromosomes. DNA sequencing involves decoding the base-pair sequence of sections of DNA encode specific proteins. Sequencing and mapping - surveying each of the 23 pairs of human chromosomes to locate genes or other important markers - are two phases in the human genome project. The human genome is a complete genetic blueprint - a detailed plan of every gene expressed in all 23 pairs of human chromosomes.
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