>>11868270 It's because recessive alleles are common. For example a recessive allele that lowers your IQ by five with 10% prevalence will only affect 1% of non inbred population, but somewhere areund 2.5% if you are inbred. The rarer the allele, the bigger the effect. (X^2 vs X*.25, or at least roughly so)
>>11868316>>11868337The effect don't stack up and it doesn't matter how outbred you were in the first place, siblings are always fully inbred. (In fact the worst effects may disappear over time because the affected will die) The effects are non-heritable, the effects are gone when you have offspring with an unrelated person.
>>11868353>>11868573Not really. You are likely to have a mix of extremely good and extremely poor grandchildren when you mix two distinct populations. Multiple distinct populations with occasional interbreeding seem to be the optimal situation. Too homogenous, and it will be to hard for rare alleles to get ahead, no mixing and they cannot spread to the other populations.
