Greying Wanderer
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Tomenable
The recent paper about the UK said lighter skin had been positively selected for.
If so it might be the case that x% of pigmentation genes arrived in different parts of Europe and in some places (more northerly) they were selected for and became 2x% and in other places (more southerly) they weren't selected for and stayed at x%.
Areas were CWC did not extend - France, Iberia, Italy, etc. - are still on average darker-skinned than Balts or Scandinavians.
The recent paper about the UK said lighter skin had been positively selected for.
If so it might be the case that x% of pigmentation genes arrived in different parts of Europe and in some places (more northerly) they were selected for and became 2x% and in other places (more southerly) they weren't selected for and stayed at x%.