My blood type is A , but my parents are both O, How is that genetically possible?

Question

And, for the record, I'm pretty sure my mom didn't cheat on my dad.

Answer 1

Ok, how can you be sure there was no infidelity?

I am no expert on this but I have 2 brothers and I know that one one them does not have my bloodgroup.

I suggest you gather more data and speak to a Dr.

When all is said and done you are a person bright enough to ask a genetic  question on the internet,

It might be best to have a good life and noy ask potentially explosive questions.

Answer 2

Mutation?  

Answer 3

As sure as you may be, one of your parents is not your parent.  You've been lied to.

Answer 4

Most likely explanation:  Lab goofed on the tests for you or one or both of your parents.

Second most likely:  Your dad isn't your biological father.

Third most likely:  You were switched at birth (which actually falls under "dad isn't dad")

Fourth:  You had a bone marrow transplant at an early age from a type A donor, and no one told you about it

It's not Bombay phenotype.  If both your parents had Bombay, you'd have Bombay too, and would erroneously show up as type O.

Answer 5

Are you adopted?

Answer 6

I'd say approach this whole thing VERY carefully. Not every family has the "truth at any cost" mentality, some have more of a "let sleeping dogs lie" attitude. Go charging around like a bull in a china shop and you could have a lot of regrets later, depending on what you find out and who you hurt in the process. My advice (and no, I have NOT gone through this exact thing, but every family has  and "secret history"...) is to start at the beginning, and move VERY carefully.  You don't say how  old you are, but this "mystery", if any, has likely been in place 18+ years, so you can probably afford to go slow.

First of all,  "make sure you know what you know".

Get re-tested. Lab mistakes happen.

Second -  Are you SURE both of your parents are "O". It CAN be wrong on a driver's license, since that info is self-reported the first time you fill out the forms, and not EVERY 16 year old filling out a form gets it right!

If after you double check you are still left with "O+O=A" you are kind of left with "talk to your Mom (alone)". There are a couple of relatively easy solutions options that she/they just never found the right time to tell you about -  artificial insemination, egg donor,  "regular" adoption.

There are some moderately complicated situations -  family adoption (aunt is really your mom, etc.) ,  unofficial adoption (with it's accompanying legal citizenship issues if you were adopted from a foreign country) etc.  and a couple of much, much more difficult scenarios - rape, infidelity, Mom was pregnant when she married and did/didn't know, did/didn't tell your Dad... .

The "weird genetic anomaly",  "one parent is a Chimera"  or the infamous "baby switched a birth" scenarios are possible....but more common on TV than real life.

Whatever you do, move slowly, and think carefully, and act with kindness and understanding - it affects your whole family, and you may not get to "undo" anything once you start the whole ball rolling.

Answer 7

Maybe you aren't your Father or Mother's child. Maybe it was accidental. Do you know if either of your parents have been divorced?

Answer 8

That is highly unusual; I have never heard of a case of this.  The most likely explanation is probably a mistake in typing, followed by some hitherto unknown issue of adoption or parentage.  The least likely, would be a genetic mutation--type O blood is actually defined by the lack of certain proteins called agglutinogens.  If one of your parents had a mutation which inhibited expression of that agglutinogens, then it is possible you inherited the genotype AO and did not inherit the gene which inhibits expression of the A agglutinogens.  That is reaching, however, and the possibility is extremely remote.  

If you found out your blood type from a doctor, ask him or her.

Answer 9

First of all i don't believe your adopted, if you are, they'd tell you right away that they had just adopted you. So back to my answer, are your parents' blood type contains O purely??? If not, there are possibilities that there blood contains a little bit of A. They have an O blood type for it "empowers" the A. In your case, when both your parents' blood type A were combined, there is a little possibility that you or your siblings will have an A, in your case, that is absolutely you.  

Answer 10

ok, if you are sure about your mom and dad that they are your biological parents,  there is a genetic condition called Bombay Blood group that you can check it out at wikipedia. in this condition the real blood group(depends on individual's genetic) is other than O maybe A or B or AB but evidence shows it O type (by blood typing). one of your parent may show bombay phenotype, since this is genetic condition, that is heritable, his or her A  gene(allel) has been inherited to you (but you do not show bombay conditon, that is you are not O, because it is a recessive trait) and your blood type becomes A. you can also consult with this condition with a geneticist.

Answer 11

blood group O doesnt mutate to A.. O contains H antigen which is the pre cursor of A and B antigen... while haematopoisis H antigen might have changed to A antigen. it is a very rare case... u are one of it.... never blame ur parents for all these things....

i have a case like parents are Rh+ but child is Rh-....

every thing is possible.. which is not..science terms it as rare .. because some chances are there which can make that immposible thing posible, and science know this.