If the father's blood type is AB mother's blood type is O positive can the child's blood type by 0 negative?

Answer 1

Regardless of which parent has which blood type, if one parent has type A and one type AB, the child could have either A, B, or AB. If one parent has type B and the other parent type AB, the child could have either A, B, or AB. If both parents have type AB, the child can again have A, B, or AB. And finally if one parent has O and the other parent has AB, the child could have either A or B. It doesn't matter whether the parents blood type is positive or negative for the above examples. For further explanation, go to this website.
http://www.bloodbook.com/inherited.html Anthony in San Diego

Answer 2

no, one parent must be A and the other must be B. A & B are both dominant blood types, where O is recessive. Everyone has 2 blood type genes. For someone to be O the must be O & O. For someone to be AB, they needed to inherit the dominant A gene from one parent and the dominant B gene from the other. If someone is O they have neither, so they cannot pass A or B on to their child.

Answer 3

In normal cases, no. In order to be an O blood type, a person needs to have two O genes, one from each parent. An AB person has one A and one B, so under normal circumstances an AB person cannot have a type O child. However, there are a couple of very, very rare cases in which it can happen.

First case, the AB person has both the A and the B on the same chromosome, and nothing on the other side. This can happen, very rarely, when there is an error in replicating the genes. Sometimes genes cross over to the wrong chromosome. In that case, the patient would pass on either the A and B together as a set, making the baby an AB, or the gene without any ABO type. In that case, the baby would be a true type O, even though it only had one O gene from its mother.

The second case is more common, but not technically an O blood type. The baby could be a Bombay phenotype, which can look like a type O. The name Bombay comes from where it was originally discovered, in India. The baby would actually have the genes to be a type A or a type B, but would be unable to express them. What happens is that there is another protein on the surface of the red blood cells that the A and B need to attach to, called the H antigen. Nearly everybody has the H antigen, but some people lack the gene that makes it. People with the Bombay phenotype can donate red blood cells like they're a type O, but if they need a transfusion themselves the only blood they can handle is from other Bombays.

For more information on Bombay phenotype, check out this Wikipedia page. http://en.wikipedia.org/wiki/Hh_antigen_system

Answer 4

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

Parental information:

• Mother type Apos --can be AA or AO with Rh (++) or (+-)
• Contributes genes A, O, (+), (-)
• Father type Apos --can be AA or AO with Rh (++) or (+-)
• Contributes genes A, O, (+), (-)

Baby receives one gene from each parent:

Note: in all cases the Rh factor might be (++), (+-) or (--), so positive or negative.

• Baby is type AA = Type A pos/neg
• Baby is type AO = Type A pos/neg
• Baby is type OO = Type O pos/neg

The Rh negative blood type is definitely a possibility with these parents, but in order for the baby to be AB, one parent MUST contribute the B gene. Since the parents only have the chance of contributing an A or O, there cannot be a Type AB offspring.

Answer 5

No. The child can has a 50% chance of having type A blood and a 50% chance of having type B blood.

Answer 6

There is no way to tell what type he was from only this information; he could quite literally have been any bloodtype at all.

Answer 7

Yes, absolutely. The only blood type her son could not be is O.