Biology 180 was the first course in a three-quarter introductory biology sequence for undergraduates intending to major in biology or related disciplines at the University of Washington. The five-unit course met for four 50-minute class sessions and one two- or three-hour laboratory session each week. The study analyzed six quarters taught solely by S.F., with 400 exam points available each quarter. Most students had completed a chemistry prerequisite and were sophomores. In the most recent analyzed quarter, students were 61.1% female and 38.9% male; 46.7% Caucasian, 38.5% Asian-American, 7.4% from underrepresented minority groups, and 7.4% did not declare an ethnicity. Additionally, 16.4% participated in the UW Educational Opportunity Program. The study reports that these demographics were typical across the quarters and years analyzed.