what about, those humans that were populating other worlds? could they not have evolved/mutated to survive better in there environment? over generations of course
There are simply not enough generations. Evolution works over millions
of years, not thousands. This is especially the case when one considers that for much of this time, the colonies had access to the STC systems that made environmental factors much less critical to survival.
Originally Posted by DeathJester921
Actually, it seems to me that Sasha's point is relevant. At least its relevant to when the humans in 40K were colonizing other worlds. Most likely, they would colonize the world with a small population. So over the generations, the genes would change and the humans on that planet would be able to better survive on it. In my mind, no one would colonize a planet with a relatively huge population. Sure with a smaller population colonizing a world would take hundreds to possibly thousands of years to fully colonize it, but by then, most, if not all, humans on the planet would have different genes and traits that allow them to live longer and survive better. This effect would be reversed with a larger population colonizing the same planet. Fully colonizing it would take less time, but the genes and traits needed to survive would possibly take longer to develop.
A small population increases the chances of any given gene coming to dominate. Unfortunateloy, it also decreases
the chance of a mutation (beneficial or otherwise) arising (arising, rather than manifesting), since there are simply fewer individuals in which a mutation might occur. Small populations are a double-edged sword for people who want to champion punctuated equalibrium.
Again though, even PE's most optimistic fans will still tell you that it takes hundreds of thousands of years, rather than millions.
Long Story Short: If you colonise Valhalla with sub-saharan African humans and come back 38'000 years later, the people living on Valhalla will still be tall, dark-skinned and lithe.
If you land a bunch of Eskimo on Tallarn and come back 38'000 years later, same deal.