Also worth noting that for the vast majority of people even if you've had 23andMe done you STILL have no way of knowing - by definition this condition is undetectable if the DNA test just tests one sample from one place in the body
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Also the conditions for chimerism (two different embryos combine in utero) are probably rare, but mosaicism (one embryo develops two different genetic codes due to mutation or replication error) is much more common, and the X and Y chromosomes are a likely place for this to occur
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Irl most mosaicism/chimerism is detected by accident, usually from a blood test (blood is a particularly likely place to find it because blood cells are made in bone marrow from all over the body and then all mixed together)
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Yeah reminded me of the Lydia Fairchild case https://en.wikipedia.org/wiki/Lydia_Fairchild … she almost lost her kids and went to jail because the DNA test doesn’t really help chimeras
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