The origins of quantum mechanics lies with Bohr's hydrogen model. Now, we all know that electrons do not travel in 2-D circles. Evolutionary theory is still incomplete but so were a lot of other "hard" theories such as Newton's law of gravitation.
That's right. This is pretty much my point.
I remember in Feynman's first book he wrote how he saw a seminar about a mathematical analysis that the spin state of something is one. Feynman wrote how it was a great talk and convincing -- the spin state must be one.
But, someone piped up and stated: the spin is three, they measured it.
There is no equivalent yet in evolutionary biology now to such an authoritative physical answer to a question and itchy's analogy is hot air.
With the completion of more and more genome sequences there may come a time when there will be the equivalent of "the spin is three -- they measured it". But right now, no.