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they have found that proteomics plays a huge role in how fast new evolutionary traits express themselves.
In a stable environment, the proteins responsible for maintaining a stable expression of genes are able to keep up with the system, under stress however this falls apart and all sorts of stuff happens. the shorter the reproductive cycle of an organism the sooner these modifications to their new gene expressions can show, but it can happen in just a few generations under the right conditions.
Whatever its exact mechanisms (and not yet having a clear picture of them - or of prenatal development in general - doesn't change anything), homosexuality appears evolutionary selected for, to a degree - for example, sisters of homosexual men are statistically more fertile (WRT to homosexual women... well, let's be honest, they'd be more or less forced into childbearing anyway, any traits hardly selected either way - perhaps why women are supposedly a bit more "undetermined")
But you just prefer to make up "data" or "evidence" (in other nearby posts), wish them into existence out of thin air (or, rather, from your ~Christian mythology, it seems - which BTW at some point had a problem even with the moons of Jupiter - but this is not the kind of fiction under discussion)...
...while there appears to be nothing which would block "true AI" as far as our understanding of the universe is concerned (which is BTW brought by ~science, not mythologies - in fact, what you can be pretty damn sure of is that they concede more and more; virtually everything was being explained by myths and divine intervention at one point or another, virtually everything what they once claimed turns out wrong, over time, gradually chipped off; no reason to go back now)
At the very least, we should be able to do a "brute force" approach of running a full human brain in software ...and over time streamlining it, optimising, modifying - until, from some point on, it won't be human any more. It will be more. Edited 2012-07-01 00:16 UTC