The paths that led Watson and Crick to the discovery of DNA’s structure were pioneered a century earlier, in the 1850s, when the English naturalist Charles Darwin published On the Origin of Species and Gregor Mendel, an underemployed priest in Brno (now part of the Czech Republic), began breeding peas in the garden of his abbey. The beaks of Darwin’s finches and the traits of Mendel’s peas gave birth to the idea of the gene, an entity inside of living organisms that carries the code of heredity.
