Verkligen helt oväntat, som det mesta annat i utvecklingen, så kommer då den rasbiologiska frågan upp på den mediala himlen i form av inavelsproblematik - stambeting V.S geografisk yta för indelning.

Inbreeding study reveals why humans don’t have sex with their relatives
Even 34,000 years ago, our ancestors knew having sex with their relatives was a bad idea. Analysis of ancient human remains found in Russia has revealed that even…
rt.com