Well, if you measure evolutionary rates by generations rather than years, and keep in mind that northerly adaptations are rather smallish changes that can happen over a fairly few generations with enough pressure* and a smallish population .... but that would just argue more for the loss of melanin, unless they have some way to make up for the vitamin D and lack of sunlight issue, possibly through diet; if there's enough in their food, then skin absorption won't matter so much.)
The Pern stories kind of started with the same premise, though most of the "evolution" - beyond the survivors of the og 5000 settlers breeding into mutty "future people", as would be expected - was cultural and linguistic, and we see how culture can almost completely change in, like, three generations (Ontario is actually a good example. It was very (Small c, kind of rightish Liberal for the most part in the cities, large C outside) conservative WASPy when I was growing up, and didn't even legalize "Sunday Shopping" until the 1990s - now it's primed to vote federal ND fucking P.)
*pressure, of course, means deaths caused directly, or at least more or less so, because of the trait in question, whether that trait is physical, or mental/behavioural ...
Well, if you measure evolutionary rates by generations rather than years, and keep in mind that northerly adaptations are rather smallish changes that can happen over a fairly few generations with enough pressure and a smallish population .... but that would just argue more for the loss of melanin, unless they have some way to make up for the vitamin D and lack of sunlight issue, possibly through diet; if there's enough in their food, then skin absorption won't matter so much.)
The Pern stories kind of started with the same premise, though most of the "evolution" - beyond the survivors of the og 5000 settlers breeding into mutty "future people", as would be expected - was cultural and linguistic, and we see how culture can almost completely change in, like, three generations (Ontario is actually a good example. It was very (Small c, kind of rightish Liberal for the most part in the cities, large C outside) conservative WASPy when I was growing up, and didn't even legalize "Sunday Shopping" until the 1990s - now it's primed to vote federal ND fucking P.)
Well, if you measure evolutionary rates by generations rather than years, and keep in mind that northerly adaptations are rather smallish changes that can happen over a fairly few generations with enough pressure and a smallish population ....
The Pern stories kind of started with the same premise, though most of the "evolution" - beyond the survivors of the og 5000 settlers breeding into mutty "future people", as would be expected - was cultural and linguistic, and we see how culture can almost completely change in, like, three generations (Ontario is actually a good example. It was very (Small c, kind of rightish Liberal for the most part in the cities, large C outside) conservative WASPy when I was growing up, and didn't even legalize "Sunday Shopping" until the 1990s - now it's primed to vote federal ND fucking P.)