Will not taking AP Bio (but rather Forensics) hurt my chance at college admissions?

IF the colleges you have in mind are ones that will not give preference to a heavier curriculum, then you are fine. It all comes down to your college list. If you are looking at highly selective schools, not having the most rigorous academic curriculum offered will hurt you unless you have some striking reason to not take those courses. Ask your GC how your curriculum will serve you with the schools you want on your list.