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Risks of genetic disorders in unions between relatives, though not inexistent, tend to be overplayed indeed.

The risks are not trivial for single siblings, but possibly tolerable as a one-off event if the original genetic mix has no obvious nasty recessives to worry about.

But if you set a precedent for allowing reproduction between siblings, it doesn't take more than a few generations for the probability of genetic disorders to trend towards certainty. There were many parts of the UK where travel wasn't common until the last century and the genetic mix wasn't as wide as it might be - and even without incest, that was all it took to make disorders more prevalent than they are today.

And if you allow sibling relationships you may as well allow father-daughter relationships, which creates both psychological issues and genetic issues.

Generally it's safer and simpler to consider incest a very bad thing.

by ThatBritGuy (thatbritguy (at) googlemail.com) on Thu Nov 8th, 2012 at 11:04:01 AM EST
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