Of course not an ancient writing, but from 1912: "These Yakut told me that they had observed that children born from consanguineous marriages are generally unhealthy."
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Replying to @crimkadid
I think the disadvantages of cousin marriage have been known for a very long time. Naturally, woke types are all for it - presumably in an effort to be consistent.
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Replying to @gcochran99
You might be on to something: the greatest scientific superpower of the ancient world was the only society in history where brother sister marriage was common.
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Replying to @gcochran99
"In the usable census returns, brother sister marriages account for between 15-21 percent of all ongoing marriages (n=113)."
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The census records mentioning brother-sister marriage are from later times, Roman Egypt, not Ptolemaic Egypt. There are some mentions, so it existed, but we don't know how common b-s marriage was in Ptolemaic Egypt.
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Replying to @gcochran99 @schubert_albert and
It sures seems to have been common among the Ptolemies themselves. It's dreadfully stupid - has really bad consequences. Next, most of the people working at the Alexandrian library were imports from other parts of the Greek world.
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Replying to @gcochran99 @schubert_albert and
On the upsides, the bad consequences are reversible via a single generation of outbreeding. Indeed, inbreeding tends to weed out bad genes. Of course it does this by kids dying, and "Think of it as evolution in action" is not much comfort to parents.
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Replying to @NYarvin @schubert_albert and
Well, maybe having been (on average) dumb for, say, a thousand years, has a consequence or three.
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If 20% of the population is 3 IQ points dumber, the average drop is less than one point. Now when it's royalty in particular that's inbred (and it has been), they can really make a nation suffer.
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