Figure 1.

Comparison of common content assessments between the nonmajors and majors genetics courses. Students were assessed at different time points during the semester by using identical multiple-choice questions. The average percentage correct for each assessment is shown for each group of students (error bars show the SEM). Majors significantly outperformed nonmajors on quizzes, exams, and on the posttest (*, t test, p < 0.05). There were 16 shared questions on the pre- and posttest (GCA), 21 shared quiz questions, and 23 shared exam questions.