Available the usual places: https://www.dropbox.com/s/8gv0el0anfyymed/1971-seemanova.pdf / http://moscow.sci-hub.bz/092ee3d082e9cffd04b7064c36ba808a/10.1159%40000152391.pdf (Personally, I'm impressed she managed to get that big a sample in just Czechoslovakia. Creepy. Also, note that's only one of the studies being meta-analyzed.)
It's very clear that inbreeding is really bad: to give some examples, it drives species extinct within generations, its effects are long-term and underestimated, inbreeding can result in 20+ IQ points loss in other populations such as in India and of course we all know about the Habsburgs (which was so extreme that "Charles II was moderately more inbred than the average among the offspring from brother-sister matings").
a sub-population without such a recessive trait.
What makes you think there are any human populations none of whose recessive and mutation loads affect cognition?
I'm impressed she managed to get that big a sample in just Czechoslovakia.
Her sample covers 37 years (1933-1970) and, looking at the sources, she utilized official reports including maternity homes, district courts, etc. so the sample is all Czechoslovakia had officially.
What makes you think there are any human populations none of whose recessive and mutation loads affect cognition?
I don't think this. Intelligence is strongly polygenic, as far as I know, so for everyone it's a mix of something good and something bad. But that gene mix is uneven in ...
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