<p>I’ve taken undergrad classes in field B after graduating in field A, and not been graded differently than the other students in the course. I’ve also taken cross-listed undergrad/grad courses, where the graduate students had to complete more assignments/material than the undergrads. Presumably they were graded as a separate group. </p>
<p>I don’t really see the inequality here, OP. Your apparent solution would be to have the grads doing their thing in a separate classroom, but how would that really change anything?</p>