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A little snippet from my story idea, for some context-

"The Earth Government Collapses, caused by the cutoff of resources from the Colonies. Large-Scale war soon erupts, with Nuclear Weapons being used against most of the nations on Earth. The Now-Independent Colonies intervene, but end up declaring war on eachother, most of the colonies and cities ending up being destroyed, save for the Capitals, which have extremely strong Magi-Tech shields. High-End WMDs are used on eachother, burning away entire surfaces of planets, causing mega-earthquakes, mass volcanic eruptions, boiling away oceans. Due to the detonations of these weapons, the surface of the planets were damaged, to no end. Entire crusts of planets, melted, or blown away entirely. The surfaces of these planets were doused in radiation, as well, which eliminated any traces of life that had been remaining(outside of the Capitals)"

The Humans, during the war, were stuck in the Capitals, for hundreds-of-thousands, if not millions, of years, as the war raged, the planet(s) changed, and the atmosphere turned flaming. Assuming an entirely self-sufficient Capital, being,

  • Constant Air Production, Circulation, Maintenance
  • Constant Water Supply, Circulation, Treatment
  • Constant Food Production, Supply
  • Artificial Gravity, at a level of 0.98g
  • Constant Production of Items, Necessary and Unnecessary
  • Constant Energy Supply
  • Unbreaking Shield

How might Humans adapt, or evolve, to these conditions, while not being able to exit the Capital Domes?

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    $\begingroup$ Well, in a rather similar not-quite-human circumstance, the Thals turned out mildly evil and autocratic (a lot like us), but the Kaleds went full-bore crazy/evil/exterminate-everybody-else. $\endgroup$ – user535733 May 22 at 17:10
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    $\begingroup$ From a physical perspective, apparently no major changes. From a psychological perspective, maybe they'll become a more closed society denying interaction with any outsiders and come to believe there can be nothing like what they have inside the dome, but that's pure speculation. $\endgroup$ – ProjectApex May 22 at 17:19
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    $\begingroup$ I suggest reading Isaac Asimov's The Caves of Steel and The Naked Sun; they go very in-depth into the psychology of people in this kind of situation. $\endgroup$ – The Daleks May 22 at 18:47
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Perhaps look to the effects of islands on evolution as a model?

You might not have the food pressures like a small island might have but Darwin noticed different islands had different species.

Each bubble or dome has as slightly different gene pool to start with, and some recessive traits would be different.

Sexual selection over the time period could become important. In one case a sport like basketball being popular might select for tall people, in another culture smart people might be more sexy, etc. There could be significant changes in appearance over the very long time periods.

I suppose depending on the effectiveness of the shields you could also have differences in mutation rates due to the radiation or magic etc.

But over several hundred generations, I suspect you might see differences, some domes hairy people, some smooth skinned, some taller, some with pointed ears etc. just from differences in initial conditions, and different bubbles with different cultures choosing their partners for different ways.

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