Two sisters take the same DNA test. The results show that one sister is 10% French, the other 0%. Both sisters share the same two parents, and therefore the same set of ancestors. So how can one be 10% more French than the other? Tests like these rely on our DNA to answer questions about our ancestry, but DNA actually can't tell us everything. Prosanta Chakrabarty explores the accuracy of DNA tests. [Directed by Artrake Studio, narrated Adrian Dannatt, music by Cem Misirlioglu, WORKPLAYWORK].

Prosanta Chakrabarty: What can DNA tests really tell us about our ancestry?

What can DNA tests really tell us about our ancestry?

Your DNA test results can change as more people get sequenced, highlighting the evolving understanding of human ancestry.

DNA's 1% unique genetic code complicates tracing ancestry accurately, revealing unexpected familial heritage disparities.

Commercial DNA tests analyze less than 1% of 1% of our genome, often leading to surprising or incomplete ancestral insights.