 The prominence of genetics—its impressive rise throughout the twentieth century, its infiltration of other life and health sciences, and its practical impact on human lives—made it a natural object of scrutiny for philosophers interested in science and the relationship between science and society. Philosophers have attended to a great many conceptual, theoretical, metaphysical, epistemological, methodological, ethical, legal, political, and social questions pertaining to genetics. A sample of those questions and direction to the entries where they are discussed in greater detail follows.