In one instance, the consumer genetics company 23andMe told one twin she was 13 percent “Broadly European.” The other twin’s test, meanwhile, showed she had just 3 percent “Broadly European” ancestry, and had more DNA matched to other, more specific regions in Europe. What’s more, when the twins had their DNA tested by five companies, each one gave them different results.
https://www.vox.com/science-and-heal...ence-explainer
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