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Why my parents’ blood group is B positive and mine is AB positive. How is this possible?

Please explain..
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itsok · 31-35, F
@itsok this has to be wrong my parents are both o and im a+
Penny · 46-50, F
@userfawkes1105 check the mailmans blood type lol
Neoerectus · M
@userfawkes1105 Nope. This is genetics.

IF someone gets a bone marrow transplant it can change a blood type. Unlikely, I'm guessing.

Babies also get switched in hospitals.

It CAN be painful, but I would see it as confirmation that our parents are human. If treated as their child with love, etc., what is the intrinsic difference in the end?