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[–] ooberlu ago 

Skeptical about this. Generations of inbreeding and consanguinity has to be a major factor.

https://pjmedia.com/blog/the-problem-of-inbreeding-in-islam/

"A rough estimate reveals that close to half of everybody living in the Arab world is inbred. A large percentage of the parents that are blood related come from families where intermarriage has been a tradition for generations."