The Emergence of Genetic RationalityThe emergence of genetic science has profoundly shaped how we think about biology. Indeed, it is difficult now to consider nearly any facet of human experience without first considering the gene. But this mode of understanding life is not, of course, transhistorical. Phillip Thurtle takes us back to the moment just before the emergence of genetic rationality at the turn of the twentieth century to explicate the technological, economic, cultural, and