My parent has O+ and B+ blood group. Mine is AB, am I being adopted?

Answer 1

The answer to your question is probably yes but maybe not.

ABO Blood type is controlled by three pair of allelic genes,A,B and O,of which O allele is recessive to A and B,while A and B are codominant. Thus a person of blood group B individual has genotype BB or BO.However a O group individual is OO genotypically .

Thus parents of Blood Type O and B may produce offspring ,
who may be O or B.

The logic is as follows:
Parent B may be BB or BO and produce gametes with (B,O) allele.
Parent O have gamete OO.
Thus if gametes O and B fertilized the child will be BO or simply called B.
And if gamete O was fertilized by a gamete O the child will be OO or simply called O.

Their offspring will have the following genotypes:
IbIb x IoIo = 100% IbIo
IbIo x IoIo = 50% IbIo + 50% IoIo

So, since neither parent possesses an 'A' allele, their offspring will not possess this allele and thus will not have type AB blood.

However, there is a rare condition (1 in 250,000) called the Bombay phenotype. In this condition, individuals can be genetically any of the blood types (A, B, AB, O) but will 100% of the time exhibit type O blood. Each of the blood groups is defined by the presence or absence of small branched sugar molecules on the surface of red blood cells--the presence/identity of which varies for each group. Now, in order to 'tag' if you will, the red blood cells with these sugars, an enzyme called fucosyltransferase must be present and functional. In individuals with Bombay phenotype, this enzyme is nonfunctional and thus these sugars are not integrated into the cell membrane. They still have the genes for these sugars and continue to produce them, but they are never displayed, thus they appear to be type O. However, since they potentially possess the genes for another blood group, it would be possible for two individuals (even O and O (one of which is Bombay)) to conceive children of type A, B, AB and O.

DNA Testing is the most definite test for you to get a definite answer.

Answer 2

Well, to be O you must be OO. And to be a B you must be BB.

So when he make a chart it looks like this...

B B OR B O
O OB OB O OB OO
O OB OB O OB OO

(Since B is the blood type... there must be no A present or the blood type would be AB since they are co-dominate. However, O can be present and the blood type still be B. Since O is 100% recessive, you can not have anything besides O.)

Therefore, the your A in your AB had to come from somewhere. Your "dad" is not your biological father. (Sorry, I'm in the same boat.) Having a different mom is possiable but very unlikely with the way hospitals work no a days. (VERY unlikely you were switched at birth.)

Answer 3

DNA test would have to prove or discard that.

Clinics do the the blood tests the old fashioned way, in most cases with a slip and a few drops and using the anti a anti b and rh serum.
so i suggest you get another blood test. another for your mother and another for you father and ask what type of test is more effective. theres these glass slots cant remeber there name anyways that can prove or discard blood type.

dna test would further evidence your adoption.

or just ask...thats much easier.

A would be IaIa or IAIA or IAIa genotype
B would be IbIb or IBIB or IBIb genotype
O would be IoIo genotype only...................do your punnet squares o and B cant give AB.

another possibility is your mother had an affair lol, ive seen everything at the hospital.

good luck.

Answer 4

You could NOT have an AB type if your parents have types O and B, as someone else suggested. The type "O" means a lack of factors A and B.
It is possible that one of your parents was mis-typed. There are several variants of "A" factor, and it could be it did not show up in a test a long time ago. Maybe the tests were not so reliable in those days.
Also it is possible that you are adopted or something else.
Why do you care about it? Do you love your parents and do they love you?

Answer 5

It does not mean to say that yours does not correspond to your parents,
AB = the A could be that equals the O blood type, remember the people that have O blood type can donate to all the blood groups.
The B = the B of the other parent, so no you are not adopted, but if you want any more proof have a blood test done, and a DNA test

Answer 6

blood groups depend directly on parents & can't be inhereted through other relatives
well ... O group will only be OO while B group can be BB or BO so their child can be

75% BO
25% OO
so their child will never be AB because their is no "A" gene in either parents
sorry!

Answer 7

parents with type o and type b blood cannot produce a child with type ab. one or both parents would have to have a or ab for that to happen.

Answer 8

I would suspect some hanky-pank that your folks don't want to let you in on happened. Doesn't mean you're adopted though, just means that the Milkman might be your Dad.(Or the secretary may be your mum)

Theproblem stems from the type O parent. Genetically they can only give OO, some em.....sorry to ruin your day!

Answer 9

well its not possible that u r AB when ur parents r O+ n B+, one of them should have A in their blood group, hey why dont u get urs n ur parents blood groups checked again , thers is a possibility of lab mistake...

Answer 10

It's entirely possible for you to be type AB if your parents are O+ and B+. It means the O+ parent has a recessive A gene which you inherited. You can find the details in any biology textbook and probably loads of websites too.