Well, 'Percy Jackson & The Olympians' series has some biology - related aspects. For example, the demigods have certain powers that are related to their godly and human natures which can be considered in a biological context in terms of inheritance. Also, 'The Mortal Instruments' series has some elements. The Shadowhunters have unique physical abilities which are somewhat related to their biology. And 'The Giver' by Lois Lowry has a society where biological differences are carefully controlled, which is an interesting take on biology in a fictional world.
The 'Divergent' series is quite popular. It has a post - apocalyptic world where people are divided based on certain traits, and there are biological elements related to how these divisions affect the human body and mind. Another one is 'The Maze Runner' series. The strange creatures and the way the characters' bodies adapt to the harsh environment in the maze involve some biological concepts. And 'Miss Peregrine's Home for Peculiar Children' has some unique biological - like abilities among the children which makes it interesting for young adults.