Comments by "Jack Mac" (@TheEggmaniac) on "What is the Genetic Legacy of the Vikings on Europe?" video.

Im surprised you didnt mention the Norwegian viking influence on the all the islands off the west coast of Scotland. Also the far north of the Scottish mainland like, Caithness and Sutherland. These areas were largely colonised by the vikings. Most of the western isles of Scotland belonged to the King of Norway until 14th century, with some islands not becoming part of Scotland until the end of the 15th century. Usually they were bought by the Scottish crown or given to Scotland as part of a treaty. However there is a large Norwegian genetic legacy left in these islands. Which has been shown in other studies. Perhaps not in the one you mention.
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Interesting, Im Scottish and also I1. I dont think you can put digestive issues down to your Y chromosome haplogroup. As your haplogroup only makes up less than 1% of your genome. There is no known direct link with your Y haplogroup and digestive issues. You could have inherited the genes controlling your digestion from other ancestors, including the maternal side. Chromosome 1 and chromosome 6 are know to have the genes that mostly affect human tolerance to gluten. I think people generally put to much influence down to haplogroups. The Y chromosome haplogroup is only a marker, that shows where your direct male line may have originated, as it doesnt change over the generations. The Y chromosome doesnt really do much else, apart express what sex you are. But if cutting grains out of your diet helps, then I would carry on and dont question it. Ironically I have found out Im carrying two genetic markers ( not on the Y chromosome ) for gluten intolerance, but I dont seem to have been affected by them.
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@Descroix Yes youre right, having I1 haplogroup doesnt necessarily mean you have viking origins. Just that one of your male ancestors probably came from Scandinavia. That could be a very long time ago and many many generations back. Not all Scandinavians in the past were vikings. A lot of them were farmers, fisher people, herders and had all manner of occupations. People seem to greatly generalise that having the I1 haplogroup definitely means you are descended from vikings. I1 haplogroup is found to the greatest extent in Scandinavian countries. Today more than 35 % of men on average, have it there. The further you move away from Scandinavia the more its decreases in occurrence. In Britain and Ireland its varies, around 11% of the male population. When you get to the south of Italy its about 1%.
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