• No. Not unless they're adopted. There is no B available genetically.
  • lol no but there is a thing called the cis-AB phenotype it's where a parent with AB carries both AB on one chromosome instead of carrying A on one and B on the other, it can cause a child to be AB with one parent being O. There is also the Bombay Phenotype which can cause a child to be born as an O when it seems to be impossible lol this is because there are is another factor (H) in the blood type...A and AB each have two subtypes (A1, A2, A1B, A2B) a child born with this rare form of O cannot receive a transfusion from another O donor unless they are also H deficient =)

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