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For convenience purposes all genetic studies will be posted here.
I'm super interested in genetics, so I've been reading a lot of studies recently. I think this one about Costa Ricans is pretty interesting because I haven't seen anything about them before. It is based on a sample of 426 individuals from all over the country. The section about who exactly the subjects were is somewhat unclear, but it appears that they may have excluded anyone who declared they were "unmixed". I'm not sure how representative they are of the whole population, but I know many Costa Ricans identify solely as"white" or "black" so it's very possible that many of those people were not included in the study. If that is the case, the "true" national averrage may be more European and slightly more African than these numbers indicate.
Source: http://onlinelibrary.wiley.com/doi/1...0.00612.x/full
Personal observation: They're actually somewhat similar genetically to Puerto Ricans. Based on country-wide averages, they're about 10% less European, 15% more native and 5% less African than us. I visited Costa Rica with my school once, and I'd say this fits with the people I saw there. I remember thinking that Puerto Ricans would look like them if the Taíno hadn't been eradicated so soon, and the numbers seem to be consinstent with that.
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