neither! Both can help you, but very unnecessary. You should be fine knowing general genetic principles, but not on the molecular scale. In terms of biochem, glycolysis, kreb's cycle, and a few enzymes should be plenty. For me, all that was taught in biochem 1 so... If you didn't learn that in biochem 1, biochem 2 might be more useful for you. I will say though that neither genetics nor biochem questions showed up on my version of the dat. It was more anatomy/physio. If i had to choose for you, i'd go with molecular genetics.