Genetics is fake. This is why nearly every organism has the same body plan, same number of digits, and same features. It's not genetic, it's just the only way things can work.
Any organism has a way to sense light, and sound, and whatever else, and those develop in a certain area. Then five digits exist because you need two to grab things, and one to point, and some fine control.
There's no specific gene that codes for a specific protein. You can look at the sequence for gnrh and any gene, and see it has no relation to the chemical structure of the resulting protein.
This will of course be a 1pbid as this board is retards.