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Considering the daughter of Muhammad married her close relative, that doesn’t surprise me. I think it’s common among some Hindu Indians as well.
Without going off topic, first cousin marriage used to be pretty common and the norm up until the civil war in the United States. Queen Victoria was married to her first cousin (the late Queen Elizabeth II and her husband Prince Philip were third cousins and great-great grandchildren of Queen Victoria).
pmc.ncbi.nlm.nih.gov
Even where first cousin marriage is legal, it is very rare in Christian societies.
Amish for example since they don’t marry outside their religion and (generally) don’t accept converts? Or other groups such as old order Mennonites or Hutterites that live the same lifestyle as the Amish and come from the same Anabaptist family?
From a very basic scientific understanding, that doesn’t surprise me, sadly. Genetic diversity is a must when it comes to reproduction- BUT we are starting to get off topic.Estimating the Inbreeding Depression on Cognitive Behavior: A Population Based Study of Child Cohort - PMC
Cognitive ability tests are widely assumed to measure maximal intellectual performance and predictive associations between intelligence quotient (IQ) scores and later mental health problems. Very few epidemiologic studies have been done to ...
Here you go.
Thank you for providing the source. The only thing that interested me in my quick read was that the article was published in 2014 and their measure was the WISC which was replaced in 1974 by the WISC-R. I think the results are relative (no pun intended) and would not have been changed by using the current version of the test, but I wonder why they did that. I doubt it is a textual error given the thoroughness of the article.
