This course provides an overview of selected major developments in the history of the life sciences, mainly in evolution and genetics in the late 19th and 20th centuries. It also examines key historiographical questions in the history of science. Each week we focus on one historical event and also on one historiographical issue in the history of science, but we will strive to connect them. The readings include primary sources, secondary sources, and historiographical discussions. We learn to interpret primary texts and use secondary literature in developing historical arguments.