Quetzal writes:
I see no reason why a sort of sympatric speciation based on large scale genetic manipulation wouldn't be possible, as long as the two groups never interbreed. Of course, you'd need a LOT of manipulation, then some kind of genetic or behavioral isolation for it to work. Kind of an "instant speciation" thing.
Well, you are right that you would need behavioural modifications. There will be interbreeding between all the various groups of humans, even if genetics prohibits it (technology to the rescue again to pull down the genetic barriers).
So, unless you were very deliberately trying to speciate the human species (something that would probably be very unethical to do), then I can't see it happening.
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