This course explores the vast changes that the life sciences underwent between 1890 and 2000, from a largely descriptive and qualitative, to a highly experimental and quantitative science. Topics include the rejection of Haeckelian morphology, the rise of experimental embryology, the rediscovery of Mendel and development of the Mendelian-chromosome theory, the new "ecology" of the Chicago school, the introduction of feedback and control systems in physiology, the synthesis of Mendelism and Darwinism, the rise of biochemistry and molecular biology, and the genomic revolution. In each topic biological ideas are placed in their historical and social contexts. Prerequisites: At least a high-school course in biology and/or permission of the instructor. Medium-size class. Credit 3 units. G. Allen