Comments by "Jack Mac" (@TheEggmaniac) on "Scottish DNA: What’s The Genetic (DNA) History of Scotland?" video.

@MrResearcher122 Just curious here, but how does the fact that someone has '19% DNA match for Ireland (mostly near Donegal), ' mean you definitely have the blood of of the O Neil dynasty in you? There are a lot of clans and people who come from Donegal, that are not descended from them. How do you come by this great generalisation?
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