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

Parental information:

  • Mother type A pos -- genetically AA or AO and Rh (++) or (+-)
  • Father type O neg -- can only be OO and Rh (--)
Baby receives one gene from each parent:
  • Baby is type AO (+-) = Type A pos
  • Baby is type AO (--) = Type A neg
  • Baby is type OO (+-) = Type O pos
  • Baby is type OO (--) = Type O neg
NOTE: There is no gene B here to make the AB blood.

Generally the baby will be either Type A pos/neg or Type O pos/neg.

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.

  • What if baby is Type AB?
If type O parent has the inhibitory gene affecting his BB, BO or AB type,

then the Type AB baby is definitely possible.

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โˆ™ 2013-09-30 12:55:19
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Q: If one parent has A blood type and the other has O- is it possible for the baby to have AB?
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Related questions

If one parent has B blood type and the other has O blood type is it possible for the baby to have A?

If one parent has blood type B and the other blood type O, it is possible to have a baby of blood type O or B. It is NOT possible (0% chance) to have a baby with blood type A.


If one parent has B and the other has o is it possible for baby to have a b?

Yes, the baby will have either B or O type blood.


What blood type will a baby have if one parent is A and the other O?

the baby will have the O BLOOD.


If one parent has A blood type and the other has O- what blood group may possible for their baby?

If with A + and O + Baby can have : A + or O + If with A + and O - Baby can have : A +, A-, O +, O - If with A - and O + Baby can have : A +, A-, O +, O - If A - and O - Baby can have : A + or O -


What will a baby with parents who are ab and b blood type be?

If the parent's blood type is AB and B, the possible blood type of the baby is A, B, or AB.


What will happen to a baby when his father is blood type ab and his mother is blood type o?

If a parent's baby is having AB and O blood type, respectively, the baby's possible blood type will be A or B.


If one parent has A positive blood and the other had A positive blood what type will the baby have?

The blood type would be A positive.


If one parent has B blood type and the other has A type blood is it possible for the baby to have O?

Yes, that is possible. The first parents has a genotype of BO, while the second parent has a genotype of AO. The parents have a 25% chance of producing a child with AB blood, 25% chance of A blood, 25% chance of B blood, and 25% chance of O blood.


What would be the parents blood type if the baby is B negative?

If a baby is blood type B, the one parent must have a B. The possible combinations are: One parent B (homozygous or heterozygous), other parent B (homozygous or heterozygous) One parent B (homozygous or heterozygous), other parent A (heterozygous) One parent B (homozygous or heterozygous), other parent AB One parent B (homozygous or heterozygous), other parent O One parent AB (homozygous or heterozygous), other parent O (homozygous or heterozygous) The Rh factor must be either positive heterozygous or negative in each of the parents.


Can an AB blood and B blood parent can have an A plus blood baby?

Yes - AB Parent has genotype IA IB . If the parent with B blood has the genotype IBi, which is entirely possible, then there is a chance that the baby would be IAi, and would have type A blood. Plus/minus has to do with the RH factor in blood, so you can't tell from the information given whether the baby could be "plus". If one of the parents is RH+, the baby could be as well.


Can a parent with ab- blood and a parent with o- blood make a baby with a plus blood?

No, in this scenario the possible blood types for the children are A- and B-. Positive refers to the presence of Rh factor in the blood. The Rh factor has to come from somewhere.


What blood type would the offspring have if one parent had A and the other had AB blood?

Well the baby can have blood type A or blood type B.

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