The story of the gene begins in earnest in an obscure Augustinian abbey in Moravia in 1856 where Gregor Mendel, a monk working with pea plants, stumbles on the idea of a "unit of heredity." It intersects with Darwin's theory of evolution, and collides with the horrors of Nazi eugenics in the 1940s. The gene transforms postwar biology. It invades discourses concerning race and identity and provides startling answers to some of the most potent questions...