<p>^^^ Students in pre-med tracks, economics, or psychology may have had more exposure to TAs than I had when I was at Chicago; students in those (and other) programs may be getting more today. I really don’t know. </p>
<p>But look at the numbers I cited in post #62. Those introductory science and social science courses all have enrollments of under 50 students. In the Autumn 2012 Biology listings, only 3 undergraduate courses have enrollments of (barely) over 100 students. For example, BIOS/20186 (Fundamentals of Cell and Molecular Biology) has a lecture with 107 students (3 50-min periods/week). There also are 5 lab sections (each meeting 230 min/week) with 17-24 students. The same 3 instructors are listed for the lecture and lab sections. Gayle Lamppa and Akira Imamoto are Associate Professors; Tom Christianson is a Sr. Lecturer. There may well be TAs helping in some capacity with that many hours of class time.</p>