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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

In Latin America, Native Americans, Africans, and Europeans have intermixed for centuries.

So a few years back, researchers sought to learn more about the ancestry of more than 7,300 people from Brazil, Chile,

Colombia, Mexico, and Peru.

The volunteers provided DNA samples, and they also answered the question, what do you think

your background is?

Turns out that what they thought, that is, their predicted ancestry, told a different story

than their genes did, with skin color a key factor.

Their predicted ancestry is actually very well correlated with their skin color, but quite poorly

correlated with the actual genetic ancestry. So that showed us that people are actually trying

to predict their whole ancestry, but by just looking at their skin color, which is a pretty

crude thing to do, but that's how the attitude is in Latin America.

Kostub Adikeri, who studies human genetics at University College London.

In particular, lighter-skinned volunteers tended to overestimate their European ancestry,

whereas darker-skinned subjects overestimated their Native American or African backgrounds.

Now, a new study by Idikari and his colleagues

offers a reason for that mismatch. The skin color data and the DNA sequences led the researchers

...