Comment by ABCLAW
4 days ago
It's worse than that; within a few generations our linguistic and biological systems will begin to diverge under conditions with little cross-pollination and different selective pressures. We will become aliens in the sci-fi sense very rapidly if we attempt to create a foundation-like diaspora of settlements.
This sounds like lysenkoism.
I think the skepticism warrants more work than that. Darwin's finches are an entry-level concept to learn when learning about biochemistry and genetics. Separate planets would act to separate groups into distinct genetic populations which would then have different selection pressures put upon them. Even without selection pressure, genetic drift in both populations would result in differences compounding over time.
Humans aren't the endpoint of evolution. Something will come after us, and if we're spread out on a ton of planets, there would need to be explicit counteracting forces (genetic modification, tremendous volumes of interstellar human travel, etc.) to make sure whatever comes after us is uniform among our interstellar backyard.
Most genetic drift happens during 'bottleneck' periods where >80% of the population dies due to selective pressure.
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That was explored in Stephenson's Seveneves