The very act of creating a society interferes with Darwin style evolution, since societies often work to preserve the lives of individuals who may not have the best DNA.
As to Evolution happening fast or slow, it's obviously going to be slow. After all, they're living on basically Earth type planets, just with less gravity. Since the nessecary genetic modifications were already made when the Precursers dropped them off, theres no need for any fast evolution to increase survivabilty, and if they have a functional society, little to no Darwinien pressures.
A DNA difference of 1.2% is more than enough to prevent interspieces breeding yes, but it's also more than enough to change a tall hairless bipedal mammel into a small hairy primate with a tail. Also, recent research suggest that the difference is more like 5%. Since most of our off earth humans look exactally like us, we can assume that the difference in DNA is much smaller than that between a human and a monkey.
According to this website, Native American tribes probably arrived in Alaska 20 to 30 thousand years ago. Any previous encounter with Europe before Columbus was more or less insignifcant as far as the genepool goes. Yet, as mentioned, Europians and Native Americans could breed just fine. Why? Because puny little differences like skin color and the location of your ears on your head or the color of your eyes aren't enough to prevent reproduction. Otherwise Blacks and Whites and Asians and Midgits and so forth wouldn't be able to interbreed.
The kind of genetic drift your thinking of might be a small number percentage wise, but it would represent a HUGE change to the basic human archetype. The kind of change that just doesn't happen without a massive shift in enviroment, probably resulting in a life form that's merely humanoid rather than human. Thus, wide scale genetic manipulation would be required to PREVENT interbreeding, not allow it.--
I have the power to channel my imagination into ever-soaring levels of suspicion and paranoia.
--
If you become a monster to put down a monster you've still got a monster running around at the end of the day and have as such not really solved the whole monster problem at all.
As to Evolution happening fast or slow, it's obviously going to be slow. After all, they're living on basically Earth type planets, just with less gravity. Since the nessecary genetic modifications were already made when the Precursers dropped them off, theres no need for any fast evolution to increase survivabilty, and if they have a functional society, little to no Darwinien pressures.
A DNA difference of 1.2% is more than enough to prevent interspieces breeding yes, but it's also more than enough to change a tall hairless bipedal mammel into a small hairy primate with a tail. Also, recent research suggest that the difference is more like 5%. Since most of our off earth humans look exactally like us, we can assume that the difference in DNA is much smaller than that between a human and a monkey.
According to this website, Native American tribes probably arrived in Alaska 20 to 30 thousand years ago. Any previous encounter with Europe before Columbus was more or less insignifcant as far as the genepool goes. Yet, as mentioned, Europians and Native Americans could breed just fine. Why? Because puny little differences like skin color and the location of your ears on your head or the color of your eyes aren't enough to prevent reproduction. Otherwise Blacks and Whites and Asians and Midgits and so forth wouldn't be able to interbreed.
The kind of genetic drift your thinking of might be a small number percentage wise, but it would represent a HUGE change to the basic human archetype. The kind of change that just doesn't happen without a massive shift in enviroment, probably resulting in a life form that's merely humanoid rather than human. Thus, wide scale genetic manipulation would be required to PREVENT interbreeding, not allow it.--
I have the power to channel my imagination into ever-soaring levels of suspicion and paranoia.
--
If you become a monster to put down a monster you've still got a monster running around at the end of the day and have as such not really solved the whole monster problem at all.