The limits of ancestry DNA tests, explained
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In genetic ancestry testing, even identical twins who have virtually the same DNA may or may not get the same results.
Different DNA companies can show different results, in the case of twins.
Consumer genetic testing is expanding as more than 26 million people have taken this kind of test, according to the MIT Technology Review.
DNA tests are still considered estimates, due to imperfect data.
When a person wanting to give the test provides the DNA sample through the saliva, the company checks for variance in the saliva, as 99.9 percent of the DNA is the same in humans.
Even a 99.9 percent accuracy can result in discrepancies because, with 1 million genome places, there is a chance of 1000 errors.
Human history is complicated and messy, and cannot be tracked fully with a DNA test.
DNA ancestry tests aren't completely linked to the heritage. There can be some ancestors from which we haven't inherited any DNA.
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