My older son is a data point of 1 but he was an Environmental Science major admitted to 5 UC’s out of 6 that he applied, whom loved both Science and History courses. He maxed out the AP History courses, but had some scheduling conflict with some of the AP sciences so he ended up only taking AP Biology, Honors Physics and Regular Chemistry.
As long as your student has all 3 science courses on his transcript, he should be fine in terms of preparation of a Bio-related major. How he compares to his fellow HS students will determine the HS course rigor.
I am an advocate that students should take AP courses that interest them and not specifically for college admissions.
Best of luck to your student.