Does taking 200 level classes in your junior years look bad to the admission? My biology classes are going to be all 200 level classes in my junior year, but all of them are core classes for my major. I do not take 300/400 levels because they are mostly elective or I am not interested in the topic at all. Is it necessary that you take 200 levels in your sophomore year, 300 for junior year, and 400 for senior year?