Zuko i did 1/2 bio, it is really dense content. it isn’t so much memorisation, more application in specific situations.
like for example: ‘a chicken with pink feathers is crossed with a chicken with purple feathers. offspring has both pink and purple feathers. determine its genotype.’
you don’t actually need to know the idea of genotypes, rather apply it to that situation. so yes, you do need to know what you’re talking about, but you wont necessarily be regurgitating facts.