Is it possible for me to have B+ blood type when both of my parents are type O?

Answer 1

Howdy,

No, it's not possible.

Basically, there are three types of blood -- A, B, and O. If both of your parents are "A," then you'll be "A." Same deal with "B" and "O."

Here's where it gets tricky. If one parent is "A" and the other is "O," then you'll be "A." If one parent is "B" and the other is "O", then you'll be "B." If one is "A" and the other is "B," then you will be "AB."

Now, about the positive and negative. If either parent is positive, you will be positive. You're only negative if both parents are negative.

So, long story short, if both of your parents are "O," you're gonna be "O."

Mike

Answer 2

1

Answer 3

It depends. If one of your parents is O+ then yes it is possible. If by saying they are type O you mean O- then no.

If one of your parents is O+ then you could inherit the + allele of the Rh factor from them. Then one parent could have the Bombay phenotype which masks the blood type antigen altogether. That parent could carry the B allele and pass it on to you, but type out as type O. If you inherited the B allele in the absence of the mutation in a second gene producing the Bombay phenotype then you would be type B.

Having said that, the Bombay phenotype is relatively rare so this may not be the most likely explanation, but it is more likely than a lab error.

Note: It's amazing that so many posters who are assumed to knw better go so far as to boast that they gave the correct answer thums down. It really besmirches the credibility of this site.

Answer 4

If both your parents have type O blood, then you can't have type B.

If your family is really like this, then
a) one of your parents isn't your biological parent
OR
b) the lab messed up when determining your blood type.

It's more likely the lab messed up. Get your blood tested again, before asking your parents any embarrassing questions.

EDIT: Professor M below is correct, and I am wrong. See the article on the strange and wonderful "Bombay blood group."
http://en.wikipedia.org/wiki/Hh_antigen_system

Answer 5

No.
The blood type O is recessive to both A and B. If your parents are both O, that means their genotype must have been OO. (The only way a recessive gene can be expressed is if both recessive alleles are present.) The only possible blood type for you is O.

Answer 6

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Answer 7

No. O is a recessive gene so it is only expressed when there are 2 O genes. Therefore, if both parents are type O, those are the only genes that can be passed to offspring. If both your parents are type O, you should also be type O. (The positive refers to the Rh or rhesus factor and is something else entirely...totally apart from A, B, and O.)



EDA: To Mike: Referring to Rh positive or negative, stating both parents have to be negative for offspring to be Rh negative is incorrect. i.e., An A pos father and an A neg mother can produce either A pos or A neg offspring. A pos can have pos/pos or pos/neg genes. A neg can have pos/neg or neg/neg genes. (Sorry I don't have time to go into more detail...easy enough to search it out!)


ETA2: While I agree the possibility of lab error does exist, I have to say that Blood Bank/Serology is one of the most critically important areas in the clinical lab and errors, by necessity, have to be extremely rare (reason being, errors here can easily result in death).

Also, with the Professor pointing out the possibility of the Bombay phenotype in his example, boatquay should have his blood re-typed in case there was an error, but his parents should also be re-typed. The incidence of Bombay phenotype is extremely rare (occurring in 1:250,000 throughout most of India and 1:1,000,000 throughout Europe and the Caucasian population in general) and we don't know boatquay's racial makeup, BUT if one of his parents happens to be of that phenotype they should be made aware of it in case they should ever need a transfusion they can only receive blood donated by people with the same phenotype, which, again, is extremely rare.

Answer 8

No. Biologically it is impossible. To be an O you have to have all recessive genes for that blood type ex: O from their father and and O from their mother. So there is no B to pass on to you because they have only O's to pass on to you. If you are B+ then one of your parents must be B+ also. It is possible to be B+ O but because B is dominant then they would show as B not O... again, you have to have two O's in your blood type to be O as it is recessive and any other blood type present would be dominant over O.
Thanks,
Natalie

Answer 9

Absolutely not. You have two alleles that determine your ABO blood group, and they can be one of three possible varieties: IA, IB, or i. IA and IB are both dominant alleles that produce type A and type B blood, respectively. The i allele is recessive and produces type O blood, but only if you're homozygous (meaning that BOTH of your alleles are i). So there are six possible combinations of alleles, resulting in four blood groups:

IA / IA and IA / i both produce type A blood (the recessive O allele is masked by the presence of the IA allele in the second genotype)

IB / IB and IB / i both produce type B blood.

IA / IB produces type AB blood.

i / i (and ONLY this combination) produces type O blood.

If you have type B blood (Rh positive or negative), it means you have at least one IB allele. So your genotype is either IB / IB or IB / i. If both of your parents have type O blood, then neither of them has any allele other than i; hence, it is impossible for them to have given you the IB allele. Conclusion: You cannot have type B blood if both of your parents are type O.

I hope that helps. Good luck!

Answer 10

Hmmm. Now you can ask your parents to tell you the truth. And maybe your mother will also have to tell your father the truth.

Answer 11

Definetly not, O is recessive and for both of your parents to have it, it means it is their genotype(the characteristic expressed). They cannot pass on something they do not have.