Some schools are also completely unprofessional, in my humble opinion, about how they look at grades. Some don't bother to consider where you went to school and if that lower GPA comes from a Harvard or podunck easy school.
If you don't think your science GPA will be an extremely low number, don't loose any sleep about it. The people picking you are teachers in the program, doing this application work while they are teaching, not the professional student admissions reps that selected you for your undergrad program. I'm seen some of the craziest matrixes for how some programs select their students and GPA is just one part.