![]() "You are dealing with probabilities here, not certainties," said Sarah Tishkoff, professor of genetics at the University of Pennsylvania. ![]() Experts say assigning a specific percentage is problematic. "I found out I was 16 percent Italian," says one consumer. Folksy testimonials from happy customers beam with wonder. Those challenges sure aren't conveyed in the ubiquitous TV ads. "The challenges come with interpreting those DNA sequences to say something accurate about your ancestry." "The methodology they use in determining the DNA markers is solid," said Deborah Bolnick, an anthropology professor at the University of Texas. ![]() The test showed no Greek and just 1 percent Italian. His father is Italian and Irish, named Rettaliata. My sister's son took a DNA test from 23andMe, another popular DNA testing company. The imprecisions are not limited to Ancestry. These tests are fun but rarely accurate - 10 percent Scandinavian could be no Scandinavian because the test could very easily be 10 or 15 percent off." "There has been genetic mixing for thousands of years. "It's very difficult to accurately find your ancestry under any circumstances," said Jonathan Marks, an anthropology professor at the University of North Carolina at Charlotte. So, same parents, different DNA test results.
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