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Sandtigress wrote...
Maria13 wrote...
Herr Uhl wrote...
Maria13 wrote...
Not always the case. For example, Cleopatra, although of Macedonian origin the Ptolomy's very assiduously adopted the Egyptian custom of fraternal and paternal incestuous marriage. And Byron's tussle with his half-sister produced the mathematically gifted Ida.
Was she gifted in other areas?
Actually, I've edited my post because I think Ada was actually Byron's child by Arabella, his wife, not his half sister, although he had at least one child with his half sister and there did not appear to be anything wrong with them...
Unless the family already carries a rare genetic mutation, I would suspect that most chldren born of a first time incestuous union are relatively okay (genetics/healthwise, mentally is probably a whole different story, especially in modern times). Such pairings are usually problematic in the long run because it makes offspring more and more genetically like the parents, instead of introducing the genetic variety of having new blood all the time.
That means it becomes more and more likely that a child will have two copies of a rare mutation, which could then lead to health problems. A lot of animals like dogs, cats, livestock, etc. have a decent amount of inbreeding done to concentrate good traits, for instance, and it's only when this is overdone that you really come into inherited problems. Done carefully, it's not dangerous per say - we just have a cultural bias against it. Not that I'm saying that's a bad thing to have in humans, of course.
/takes off the genetics hat
Well, yes. But if it's done through many generations it becomes a problem, thus the taboo. And that is what might happen in places that nobody wants to move to.
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