What is the value of mtDNA as a genealogical tool?
Your DNA tells a story about your past. mtDNA is very valuable for revealing your ancient past – for learning about your ancestors’ migrations into Europe after the last Ice Age, for example. Like many DNA tests, it is a powerful “disprover” – if two people have many differences in their mt genomes, they do not share a common maternal ancestor in the recent (centuries) past. On the other hand, if two people have nearly identical full length mitochondrial DNA, they do share a recent (again centuries) common ancestor – they are “DNA cousins”.
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