DNA would seem to be the only candidate for propagating instinctual behavior, yet I find that not credible. DNA mainly codes for the production of protein structures (like enzymes) and is mainly about cellular mechanisms like respiration. It is said that we have 99% of our DNA in common with another primate (Chimpanzee? Do we behave much like them?) and that we have about 50% in common with plants (Carl Sagan said an Oak Tree) which would indicate that only cellular-level information is contained in DNA.
It is a mystery how tissues and systems arise, so it should be an even greater mystery how behavior could be somehow passed along in a mechanism for folding proteins. Is there any model that definitely links instincts to DNA, such that if the DNA is altered, the instinctual behavior changes? If not, are there any candidates for the actual mechanism of instinct transmission?