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We are looking for the possible blood types of a baby.

Parental information:

  • Mother type O --can only be OO = contributes O gene
  • Father type B --can be BB or BO = contributes B or O gene
Baby receives one gene from each parent:
  • Baby is type BO = Type B
  • Baby is type OO = Type O
Generally speaking, the parents who are Types O and B can only have children who are also Types O and B.

HOWEVER: There is more to ABO blood typing that just the ABO gene.

There is also an inhibitory gene that will change any genotype into the phenotype O.

Therefore a person with genetically AB blood can be tested as having Type O.

If the OO parent has the inhibitory gene affecting his A, B or AB type,

then a Type AB baby is definitely possible.

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10y ago
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Wiki User

13y ago

If B is homozygous (AB, BB): AB or B is possible.

If B is heterozygous (AB, iB): A, B, or AB is possible.

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Q: Blood type AB and blood type B what equals that blood type?
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