When Are Cousins Actually Siblings?

Cousins whose parents are identical twins share 25% of their DNA, instead of the normal 12.5%. Sure, full siblings will share 50% of their DNA, but half-siblings share 25%. So even though children of identical twins are legally cousins, they are genetically the equivalent of half-siblings. Freaky, right?

 

 

 

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When Are Cousins Actually Siblings?

March 20, 2020

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