Eventually 'outbreeding' yields negative effects such as infertility with Neanderthals mixes. Are there similar observations for IQ? When does this start? What is the 'optimal' cousin distance?
Inbreeding bad, UKBB edition. About 8 IQ for highly inbred people in this sample below the mean. Some of this surely genetic, but also self-selection (since you don't end up doing this at random). https://www.nature.com/articles/s41467-019-11724-6 …pic.twitter.com/zr7K0q5BrU
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No such effects observed. There are some claims of outbreeding/hybrid vigor, but these fail replication. Humans are too closely related to give rise to outbreeding depression.
End of conversation
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I guess we know now why Hagen ran rings around Siegfried.
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Hmm. I’m sure this doesn’t apply to countries that have a lot of cousins hitching up, right?
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Why does inbreeding seem to lower IQ for some groups and raise it for others?
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