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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
  • Baby is type OO
Generally children of Type O and B parents will be either Types O or 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 Type O parent has the inhibitory gene affecting his Type A, B or AB blood, then the baby may be Type A or AB.

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11y ago

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