For many years now, companies like Ancestry and 23andMe have been selling DNA tests that they claim can tell people where their ancestors came from. Their tests have become quite popular, despite the fact that they often present results in misleading ways that appeal to popular racist ideas about “blood quantum.” Now, some companies are trying to convince people that they can use DNA tests to trace a modern person’s genetic ancestry back to specific ancient cultures.
One such company calls itself “My True Ancestry.” This company does not conduct DNA tests of its own, but allows users to upload their DNA test results from other companies so that their software can automatically compare their genomes to those sequenced from ancient remains. The software then generates a pie chart showing what percentage of a person’s DNA supposedly comes from each ancient culture. This company, however, and others like it, are blatantly misrepresenting both how genetics works and what ancient populations were like.
Continue reading “A DNA Test Cannot Tell You Your Ancient Ancestors”