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gbin 4 days ago

So if they do a DNA test, her sister is the actual biological mother I guess.

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astura 4 days ago | parent [-]

No, That's not how any of this works... The DNA comes from the egg, the uterus (aka womb) is just an incubation chamber.

Would only have the sister's DNA if it was an ovary transplant.

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mschuster91 4 days ago | parent [-]

> Would only have the sister's DNA if it was an ovary transplant.

Fun fact: fetal cells transmit back to the mother and can be spotted in virtually every organ afterwards - it's called "Fetomaternal cell microchimerism" [1].

It's not a far stretch to assume the transfer works also the other way around and you can detect maternal DNA in the fetus/child, but I'm not aware if there has been research around that.

[1] https://www.sciencedirect.com/science/article/pii/S138357422...

	▲	veidr 4 days ago \| parent [-]
		Yep, mom→fetus/child is "maternal microchimerism" and it is also widely studied (though less so than the reverse) and seemingly confirmed.