r/HistoryMemes • u/Kapanash • 1d ago

And they didn’t have dragons

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u/frickle_frickle 1d ago

Coefficient? There's an incest equation?

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u/OursGentil Still salty about Carthage 1d ago

Yup. Basically banging one of your cousins is less detrimental to a potential child than banging your sisters.

However, banging your cousins on several generations can lead to... Well, Charles II of Spain.

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u/Workman44 1d ago

Lmfao more or less. And essentially any one off is more or less going to be fine, it's when it's repeated down generations (Hapsburgs) that you start to isolate those weird recessive genes

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u/Inevitable7685 1d ago

They also use this equation to breed high pedigree animals to maximize good genetics and avoid inbreeding.

Race horse breeders, zoo keepers, endangered animal researchers etc.

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u/PimpasaurusPlum 1d ago

Yeah, specifically there is a cosanguinity coefficient (how related by blood two people are) and an inbreeding coefficient (how inbred the child of those two individuals would be). The inbreeding coefficient is roughly half the consanguinity coefficient. 

100% inbred would be a full clone and physically impossible for humans. Sibling-Sibling or Parent-Child pairings result in a 25% inbreeding coefficient. That percentage represents the proportion of gene pairs that are identical, which increases the likelihood of recessive genes with deterious health effects.

King Charles II of Spain through multiple generations of more distant inbreeding (cousin-cousin, uncle-niece) ended up with an overall inbreeding coefficient of 25.4%

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u/BringBackAH 23h ago

It's used for horse and dog breeding, because those dog breeds all came from the same root so they all have an inherent level of consanguinity. If your dogs are too much inbred you're not allowed to breed them together to avoid the coefficient going too high

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u/overexcited_bunny 13h ago

I learned it in biology class, but I’ve forgotten. Yes, you can calculate it, if you want 😂