In this program, NOVA reveals the clues that have led scientists to this new picture of genetic control and expression. One such clue is the surprisingly modest number of genes that turned up when technology made it possible to map the human genome. The Human Genome Project was originally expected to find at least 100,000 genes defining the human species. Instead the effort yielded only about 20,000—about the same number as in fish or mice—too few, some believe, to account for human complexity.

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