I second that math isn't a huge deal but you do need to be able to do some basic algebra fairly easily. As far as I can remember we have used math for: Renal, Hematology calculations, Biochem, Cardio (Phys and Cardiology)and for some basic statistics. Overall if you can do enough math to get through general chemistry that is all you need.
AS for genetics, I don't know about other schools but KCOM teaches you whatever you need to know about genetics and genetic disorders.