Can a blood type O have kids with a blood type AB?

Answer 1

No. O is recessive. A is dominant. O can only give O (because it is recessive, and has two O's). The A can have two genes to give as well. We know that one gene is A. But we do not know what its other gene is. We already know it can't be B because, if it was a B, she would have AB blood type. So her second gene could be an A or an O. (So OO would cross with AO or AA.) The possible results of children would be (parents) OO x AO equal either an AO child or an OO child. (50% chance of having an AO) The possible results of children would be (parents) OO x AA would equal an AO child (100% chance).

Answer 2

Yes, a Type O person can have children with a Type AB person. The ABO gene has nothing to do with the viability of an offspring. Problems occur with the Rh factor (the positive/negative part of a bloodtype).

Answer 3

Yes. The O blood type is a homozygous recessive trait. If both parents have this trait, their offspring will have the same trait. The genotype for the parents are oo and oo. The only possible result is and oo child, no matter what combination of the genes. However, all other blood types are dominant to O. So if one parent was heterozygous for B blood (and oB genotype) the offspring would have a 50% chance of being type O, and 50% chance of being type B.

Answer 4

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

Parental information:

• Mother type AB --can only be AB = contributes A or B gene
• Father type A --can be AA or AO = contributes A or O gene

Baby receives one gene from each parent:

• Baby is type AB = Type AB
• Baby is type AA = Type A
• Baby is type AO = Type A
• Baby is type BO = Type B

Generally speaking, the baby must have two O genes to have Type O blood, and the mother can only contribute an A or B with her Type AB. Therefore this AB x B mating may not produce Type O children.

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 baby's inhibitory gene has been turned "on", then no matter what ABO genes he receives from his parents, he will test out as a Type O.