<p>Look, here's where I'm coming from, and why I say, start small, you can always add other outside activities later to fill up your time. </p>
<p>1) The first year at college is a period of tremendous growth and maturation. There is a lot of adjusting that must take place as one leaves what they've always known to start new things. For some people this takes place pretty readily, for others not so much. However, EVERYONE has, at some point, a slip up of some sort, some crisis in which the world seems to be falling down around you. It might be a fleeting moment, it might be a week, it might be a month - you never know. It could be anything from homesickness, to a bad test grade, a bout with mono or influenza, or even something more serious. A smaller courseload decreases your investment during this transitional period. I'm not saying something horrible will, just that if you're only taking 15 hours, the damage is not as bad. Even taking another english course is better than something that is going to go into your science GPA and be counted against you twice.</p>
<p>2) the attrition rate for pre-meds is tremendous. Part of that is due to burnout. People go pre-med, think they have to be a science major and then get stuck with a too many labs or a poor prof, and then find themselves in trouble. There are thousands of reasons why people stop being pre-med, but one of the main ones is having to deal with too much science at once. If you truly love science (like wouldn't mind being a PhD in the field) this is less likely, but there are plenty of people who like science enough to be doctors that end up as bio majors b/c they think they have to be and then despise having to take 2 or 3 lab courses a semester. Why set yourself for this early?</p>
<p>3) GPA is one of the few things that if you mess up early, it stays on your record and medical schools will see. Even dropping a class shows up, and if you, heaven forbid, end up with a 'W' that does have a negative effect on your application. Plus, courses cost money. Any of the other things I've mentioned, don't, and if you really don't like them, there's no harm done to your application. If you hate the Doc that you shadow, you can still put down you did it, and then find another. If you realize that volunteering in the ER is not what you hoped for, you can find a different hospital or another floor to work on. If the pre-med club is worthless, no big deal. If your job sucks, you can get a new one. You get a B- or worse in a class, that matters.</p>
<p>4) Classes aren't everything, and medical schools don't care about how many hours you take a in a semester. While GPA is important and follows you around, it is most certainly not the only consideration. If your school work prevents you from taking part in the other activities necessary to secure admission into medical school, then it's hurting your application, even if you get A's in all your courses. Med school admissions are a very holistic evaluation of the candidate and you can't get in on just GPA and MCAT.</p>
<p>I have taken genetics course but I of course have not taken the genetics course you will take, since we go to different schools. I will guarantee that it will go far more in depth than any AP bio course, simply from the fact that you will only cover genetics topics during the ~45 hours you'll have of genetics class over the course of the semester. The fact that you even asked that question leads me to believe that you don't understand the nature of college courses and how they differ from HS classes. All the more reason to only go with 15 hours...</p>