It's such a big taboo that there's no direct evidence of those genetic disorders for humans.
On Galapagos islands brother and sister goats escaped and turned into 250,000 goats within a few years.
If the inputs are good, the copies are generally good too, and vice versa.
Its the alliance-building you miss out on. Villages that didn't trade women didn't make it.
Humans are most avarious, jealous, backstabbing gits; but we hesitate to do that to a probable nephew.
If those villages didn't have records (usually church), how would you know?
There was a woman who used a murder for hire honeypot on some forum, for her parents. And babies are sold in Afghanistan.
I'd say it's an arbitrary restriction until disproved in practice. And now I have to play Sweet Home Alabama
well no, recessive genes are a thing. which means that you typically need two copies of a bad gene for the genetic defect to manifest itself. usually you only get two copies of the same bad gene if your parents are siblings.
but inbreeding itself doesn't produce bad genes - it simply produces bad gene PAIRS. this is bad for the parents and the child in the short term but actually good for humanity in the long term because it speeds up the elimination of bad genes from the gene pool.
these bad genes can only be eliminated if their effects manifest themselves which will only happen when they form a pair so actually inbreeding is a good thing from that perspective.
also since you and your sister both carry two copies of genes not all your kids will end up sick. some of your kids will die and you will simply make extra ones and the ones that made it will have higher genetic quality than if you married normally and simply MASKED genetic defects rather than flushing them out.
of course i wouldn't risk it personally. that is i would rather have healthy kids of poor genetic quality than unhealthy kids of high genetic quality. but that's where surrogate mothers and so on can come in.
if you and your sister ( or daughter ) get along well there is no reason to not also be fucking ( except that of course you will be turned into pariahs )
OK, then how about cloning the sis then? If she's hot, she gives birth to another hottie.
the problem with cloning is it will never produce anything better than what you are starting with. best case scenario it will produce the same thing, but probably with some defects.
the idea is to randomize combinations so that there will be some really bad combinations and some really good and you discard the bad ones and multiply the good ones.
but there is a limit to how much you can randomize things. like race-mixing is the ultimate in randomization but you can only race-mix maybe 2 or 3 times before everybody is of the same milk chocolate race and you can't "race-mix" anymore.
so it should be fine to in-breed 90% of the time so long as you also occasionally breed outside of your own genetic pool.
You just described modern cattle breeding. That's why good hamburgers are so juicy.
if the sis is really high quality there should be no harm in cloning her a few times and fucking also the 12 year old versions ...
eventually though you have to mix things up - can't clone forever ...
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