I have nagging doubts that the random genetic mutation process of natural selection is sufficient to explain evolution, even when coupled with sexual selection (Darwin proposed that evolution is driven by both natural selection and sexual selection).
This is because there are billions of base pairs in the genomes of complex creatures like humans, which equate to billions of independent genetic parameters which define these creatures.
It has been calculated that if you seat monkeys in front of typewriters and get them to press random keys, even a whole universe of monkeys furiously typing away since the dawn of time are exceedingly unlikely to write out just by chance the complete works of William Shakespeare. Each letter in Shakespeare is an independent parameter, and a monkey would need to get every single letter right in order to type out Shakespeare's works.
This is roughly what I mean when I say that there are billions of independent parameters in the genomes of complex creatures that the random mutation process of natural selection would have had to get right in order to create such creatures within the 4 billion year timeframe that life has existed on Earth.
Although this typewriter scenario is not a good analogy, as nature's experimental new gene mutations are tested against their environment, so each mutation can be checked for its "truth or falsity", that is to say, whether it aids the survival of the organism or not. Whereas the monkeys have no way of testing whether each letter they type is correct or not.
But the complexity of evolution comes from the fact that many of these mutations are being tested at the same time, which makes it harder for nature to keep track of which mutations are causing the survival benefits.
So my question is, what sort of mathematical formalism could be used to analyse whether natural selection can reliably operate under such conditions of multiple simultaneous mutations?
I am looking for a formalism that could be used to either prove or disprove the idea that natural selection is capable of driving evolution to create complex creatures within a 4 billion year timeframe.
I am not proposing creationism here by the way, I accept complex life came into existence via evolution, it's just that I have some nagging doubts that natural selection alone is capable of being the motor of evolution.
Possibly rather than relying purely on natural selection and sexual selection, evolution might have also made use of certain quantum computational capabilities and optimisation processes naturally present in the universe, things like quantum computation, and quantum entanglement over both spatially and temporally distant points.