Very early in the interview season (Sept 2006) I had not taken the genetics or biochemistry requirement, but still KCUMB called me up and gave me an interview (pre-secondary application). I almost didn't go to the KCUMB interview because I was waiting for my acceptance to Western COMP. I went to Kansas City and had an great low-stress interviewing experience. Much better than my previous medical school "stress" interviews. The admissions committee gets back to you quickly.
Two weeks later, in October 2006, I received a letter in the mail from KCUMB: "You have been placed on the alternate list. Your acceptance to KCUMB is pending completion of your 1 semester of biochemistry & 1 semester of genetics."
KCUMB is a great school, & I probably would've fought to get a seat if I didn't have offers from other schools. I don't think that I wasted my time interviewing at KCUMB, but I did waste a lot of money by flying there & getting a hotel.
Therefore... my advice is plan on having all of your requirements (genetics, biochemistry, English, etc) completed by the time you interview at KCUMB. You'll be better able to secure a seat, rather than be placed on an alternate/waiting list while you complete those final genetics and biochemistry requirements.