science-biology

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A family member recently found out her child's blood group was AB+ yet hers is O+.

thanks

• science-biology -

My understanding is that is not possible. The only blood groups from an O mother are O, A or B, depending on the blood group of the father, but not AB. The mother would have to be A, B or AB. So I would conclude that the mother is not the child's natural mother.

Unless I have missed something!

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