James Watson, the American biochemist who has died at the age of 97, was responsible with Francis Crick of the UK for the most important biological discovery of the 20th century: the double helix structure of DNA, the molecule that carries genetic information.
During their two frantic years together at Cambridge university’s Cavendish Laboratory between 1951 and 1953, the brash and virtually unknown newcomers beat several famous scientists in the race to determine the shape of DNA.
Although nothing in his subsequent career could match the impact of the double helix discovery, Watson went on to make a distinguished long-term contribution to genetics and cancer research. However the professor’s personal reputation was tarnished by a growing tendency to make sexist and racist comments in later life.