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I think that is probably due to the Irish DNA being formed under northern climatic conditions (hence the generally pale skin). After all, central Ireland is the same latitude as northern Germany.
I meant to answer your other question about the Bretagne/Brythonic DNA being common to both Britain and Wales. Proportionally, it is actually more common in Wales (over 50%) than it is in Bretagne (about 40%) so there seem to be two possibilities:
i) Migrating Britons took it to north-west France.
ii) It was originally more common in Bretagne but later became partially eclipsed by the general French DNA while in Wales it was better preserved due to the mountainous terrain (= less gene-flow).
I think the second theory is more likely.
This info. I got from Wikipedia also gives food for thought:
"The last centuries before the Roman invasion saw an influx of mixed Germanic-Celtic speaking refugees from Gaul (approximately modern day France and Belgium) known as the Belgae, who were displaced as the Roman Empire expanded around 50 BC. They settled along most of the coastline of Southern Britain between about 200 BC and AD 43, although it is hard to estimate what proportion of the population there they formed. A Gaulish tribe known as the Parisii, who had cultural links to the continent, appeared in Northeast England."
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