Can a father with type O pos and a mother with type O pos produce a child with A B negative blood?

Answer 1

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, since neither parent has an A gene to contribute, the baby cannot be Type A.

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 or AB blood,

then the Type A baby is definitely possible.

Answer 2

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

Parental information:

• Mother type O pos -- can only be OO with Rh (++) or (+-)
• Genes contributed: O, (+), (-)
• Father type A pos -- can be AA or AO with Rh (++) or (+-)
• Genes contributed: A, O, (+), (-)

Baby receives one gene from each parent:

Note: the baby can be Rh pos or neg in each case.

• Baby is type AO = Type A
• Baby is type OO = Type O

Since neither parent can contribute the B gene, there can't be a Type B child.

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 B or AB blood,

then the Type B baby is definitely possible.

Answer 3

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

Parental information:

• Mother type A neg --can be AA or AO with Rh (--)
• Father type O neg --can only be OO with Rh (--)

Baby receives one gene from each parent:

Parents can only contribute the Rh (-) gene; therefore, baby will be Rh negative.

• Baby is type AO = Type A neg
• Baby is type OO = Type O neg

These parents CAN have a Type A baby, but the Rh factor would be negative, since neither parent has an Rh (+) gene to offer the child.

Answer 4

not possible.