Well, I took the maximum load they'd allow us this year (three classes each semester), whereas some of my classmates only took the two per semester that were required. So Genetics requires six classes and I've now taken six, though I could have stretched those through next year.
I dunno why Yale requires so few classes, though. Maybe they assume we took a lot in undergrad? Maybe they think our profession is better learned in the lab than in the classroom? I dunno. I'm gonna miss classes.