Why don't biologists use biology to create super intelligence instead of CS engineers making computer AI?

Many people mistake Artificial Intelligence to some self-thinking program but it's just a bunch of "if" and "else" code statements written by a programmer in a certain language like python or c.
True AI would have self-awareness, reasoning, self-thinking and that's a thing a person from medical and biological background could create not computer engineers and programmers.
Programmers only create set of instructions for a machine.