The essays collected in The Politics of Heredity explore the political factors underlying shifts in thinking about the role of nature and nurture in shaping human behavior, and about the desirability and feasibility of controlling human reproduction. They ask why many assumptions that were simply taken for granted as late as the 1950s and '60s came to be considered fundamentally mistaken in the 1970s and '80s. They also suggest that some apparent shifts in thinking were not as deep as they may seem, and that changes in rhetoric may obscure the stability of core underlying beliefs.