Will my application be weak if I apply having fulfilled the prerequisites, but not having taken any upper division courses yet? I could apply in a year if I concentrate the remaining prerequisites over the next four quarters and take all the upper division credits required for my major after the fact... will that be a weak application though?
No it wont hurt at all,
IF your required pre-req's come out to a 3.6+. in fact, your application would look even better in my opinion if you did very well in the pre-req's and took humanities courses instead of upper division credits. This shows that your curriculum was balanced and you are able to do science as well as nonscience well.
Here is something to consider: Med Schools have "required" courses that you need to have completed in order to be accepted. Now they could easily add on more courses to that list like microbiology, physiology, genetics, biochem, etc..... and since a majority of students are bio or science majors, this should not be a problem... but why are these upper level courses not required for admission.... because they want a well-rounded curriculum.......
admission officers cannot hold an applicant accountable for not having taken upper level science courses, because on their own website these courses are not required.... the only way admission counselors compare applicants is through the prereq's and MCAT, since those are the two things that every premed has taken.
From my opinion, the strongest application is a nonscience major who has gotten all A's in the required prereq's as well as done well in humanities courses... and to prove competence in the sciences, the MCAT is a big equalizer....
so there should absolutely no problem in admissions not having done any upper level science courses if you did well in the pre-req's..... dont listen to some of the bio majors on SDN or premed advisors about upper level bio courses being "required". The reality is it is not, and students should take upper level bio courses because of interest, NOT because of admissions or what people tell them..
if your GPA and MCAT are good, I would apply