3 ms·

Repeated inbreeding within the 4th degree of kinship[1] is observably dysgenic too. A society's breeding mores have genetic as well as cultural effects. In fact

by User23 6y ago

Repeated inbreeding within the 4th degree of kinship[1] is observably dysgenic too. A society's breeding mores have genetic as well as cultural effects. In fact the two are so closely intertwined I don't believe they can be practicably separated. [1] Degrees are counted by how many nodes in the tree have to be traversed upward to reach the nearest common direct ancestor. For example siblings are second degree since the two siblings share a common ancestor. An uncle and nephew would be 3rd degree, first cousins 4th degree, and so on.

throw0101a 6y ago
As the Spanish royals found out, problems tend to arise when your family "tree" is actually a circle. * https://www.discovermagazine.com/the-sciences/inbreeding-and-the-downfall-of-the-spanish-hapsburgs https://www.discovermagazine.com/the-sciences/inbreeding-and... * https://en.wikipedia.org/wiki/Charles_II_of_Spain https://en.wikipedia.org/wiki/Charles_II_of_Spain
inglor_cz 6y ago
Some of the highest levels of cousin marriage are found in the Middle East. https://en.wikipedia.org/wiki/Cousin_marriage_in_the_Middle_East https://en.wikipedia.org/wiki/Cousin_marriage_in_the_Middle_... This must have some serious negative effect on the societies there, especially when done for 50 consecutive generations.
- Hitton 6y ago
  Of course it does. British Pakistanis are 13 times more likely to have children with genetic disorders than the general population. And everyone knows why is that. https://www.muslimcouncilofamerica.org/cousin-marriage-among-muslims/ https://www.muslimcouncilofamerica.org/cousin-marriage-among...
Meandering 6y ago
It's weird how human behavior mirrors scientific basis without pre-existing knowledge. It seems Roman Law required, exactly, 4 degrees of familial separation. "Roman civil law prohibited marriages within four degrees of consanguinity[44] but had no degrees of affinity with regards to marriage." https://en.wikipedia.org/wiki/Incest#Antiquity https://en.wikipedia.org/wiki/Incest#Antiquity (Top of third to last paragraph in section)

by User23 6y ago

throw0101a 6y ago

As the Spanish royals found out, problems tend to arise when your family "tree" is actually a circle. * https://www.discovermagazine.com/the-sciences/inbreeding-and-the-downfall-of-the-spanish-hapsburgs https://www.discovermagazine.com/the-sciences/inbreeding-and... * https://en.wikipedia.org/wiki/Charles_II_of_Spain https://en.wikipedia.org/wiki/Charles_II_of_Spain

inglor_cz 6y ago

Some of the highest levels of cousin marriage are found in the Middle East. https://en.wikipedia.org/wiki/Cousin_marriage_in_the_Middle_East https://en.wikipedia.org/wiki/Cousin_marriage_in_the_Middle_... This must have some serious negative effect on the societies there, especially when done for 50 consecutive generations.

Hitton 6y ago
Of course it does. British Pakistanis are 13 times more likely to have children with genetic disorders than the general population. And everyone knows why is that. https://www.muslimcouncilofamerica.org/cousin-marriage-among-muslims/ https://www.muslimcouncilofamerica.org/cousin-marriage-among...

Meandering 6y ago

It's weird how human behavior mirrors scientific basis without pre-existing knowledge. It seems Roman Law required, exactly, 4 degrees of familial separation. "Roman civil law prohibited marriages within four degrees of consanguinity[44] but had no degrees of affinity with regards to marriage." https://en.wikipedia.org/wiki/Incest#Antiquity https://en.wikipedia.org/wiki/Incest#Antiquity (Top of third to last paragraph in section)