My wife is A+ and I am B+ how could our son's blood type be O+, will this change?

Question

No, he was not switched at birth and the lab has done multiple tests on both our child and us to confirm this.

Yes, and we have done a paternity test, I am the child's father.

OH... sorry

O h oh, yeh, we've taken him to mayo, he is on a precautionary list or something, we have to take him every 6 months to get blood drawn for himself. strange.

Answer 1

Your wife is A+ with a recessive "O" gene, you are B+ with a recessive "O" gene. If the two of you had four children you would get:

AO (wife) BO (you)

Kids: AB, AO (would be A), BO (would be B) and O

Your child got the recessive genes.

Answer 2

There are two ways to be type A (the +, or Rh factor, doesn't matter here), one is to have two copies of the gene for type A, and the other is to have one copy of the gene for type A and one copy of the gene for type O, which is, in effect, "silent" because the gene for type A is dominant. The same goes for type B. Type O has to have two copies of the gene for type O. The reason your son is type O is because you each have one copy of the gene, even though your blood types don't reflect it. Your son, having inherited two copies of the gene, displays the O blood type. This will not change.

Genetically speaking, you and your wife have a 25% chance each time you have a child to product any of the four blood types, and if you produce a child with type A or B, they will also have a gene for type O just like his parents (the O would come from the parent who didn't contribute the A or B).

I'm surprised they even tested for parentage - this is nothing new and should have been explained to you before genetic testing was considered. It wasn't necessary. Now, if you were type O and your wife was type A, then a son who was type B would present a problem.

Answer 3

Blood type A can either be AA or AO
Blood type B can be either BB or BO

In either case, the A or B is the dominant gene, the O the recessive, so if you have AO blood, it is condensed to just "A" and the same thing for type BO condensed to "B".

For the child, each recieves one "letter" to the child, hence your wife gave either an A or an O, and you gave either a B or an O. Your children could have one of four different blood types:

AB--->Type AB
AO--->Type A
BO--->Type B
OO--->Type O

Each scenario has a 25% chance of occuring. The child's RH factor then is postive because you and your wife are both positive. And you're son's blood type will not change.

Answer 4

why would the lab have to do multiple tests as what you describe is not in the least bit unusual or strange to any medical professional who understands the ABO blood type system. Each individual has 2 genes for the ABO system (one from each parent). Each gene can be A, B or O. The A and B are both dominant over the O but not each other. The different combos are: AA, AO, BB, BO, OO, AB. These will correspond to the following blood types: A, A, B, B, O AND AB. So obviously your wife's genotype is AO giving a phenotype of A and your genotype is BO giving a phenotype of B. You both carry the recessive O and your sperm and her egg that created your son each carried a gene for the O, so he is OO.
With your wife's and your genotype it is possible for you to have kids with the following genes combos: AB, AO, BO and OO, giving respectively the following blood types AB, A, B and O.
No mystery whatsoever!!!!! The + refers to the Rhesus system and is a similar dominant/recessive thing.
BTW his blood type is forever, it will not change, just as your's won't.

Just to clarify, some people are saying that O+ is the universal donor---- not true. O- is the universal donor ( if no type specific blood is available everyone can accept O-) and AB+ is the universal acceptor (they can receive blood of any of the other types if no AB+ is available)

Answer 5

The child is of course urs.There was no need 2 go for a paternity test.Lab personel shud know that.It goes with the law of dominance.Evry character v hav is controled by 2 genes.Ur blod group is 1 such character.If u are B+,u wl b havng eithr of the 2 gene combnatins BB or BO.B in these two is dominant.since ths gene is presnt in both combnations ur blod group is B in eithr case but this wl determine blood group of ur children.Ur wife may b AO combination so that ur gametes that fused durng fertilization were both OO.Since O is recesive nd there is no othr dominatng gene blod group wl b O.Gametes hav only one Gene for blood group so that durng fertlizatn one frm each parent combines to form two.Hope u undrstand.Dont blame ur wife man.

Answer 6

Your wife is AO and you are BO. Your son got the O from each of you. I can't believe the health pracitioner who is ordering these multiple tests from the lab didn't know this. You learn this in high school biology or in health class.

Answer 7

Don't worry....perfectly normal. When I took Bio I found out I was O and my parents were A and B and I was convinced I was adopted till the teacher explained that with an a and b parent you could have kids that are a, b, ab, or o.

Answer 8

No It wont change, and no your wife did not sleep with the milkman (but I actually laughed when i read that one!) Anyway, its just that the O blood type is a recessive gene and your son got it.

Answer 9

You cannot change your blood type.

There are two alleles for blood type in each person. It is likely that your wife is A/O, and you are B/O, the possible blood types for your children are A/O (type A blood), B/O (type B), A/B (AB), or O/O (type O).

Answer 10

Your son doesn't have to have either of his parents' blood type. There are certain rules but I don't remember them off hand. I am also O+ and I believe that is the blood type that can give to everyone. Blood types don't change.