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Say someone has a 3rd or 4th great-grandfather from Portugal but the rest of their ancestors are from the British Isles. They wouldn't have more than 2 percent Portuguese admixture and the rest from NW Europe. Is 2 to 3 percent of something visible or would it be impossible to discern, drowned out by all the other influences?
Any real-world examples of a 2 percent admixture being visible?
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