What blood type is ”AO”?
Is "AO" a valid blood type? I've heard some people mention it, but I'm not sure if it actually exists. Could someone clarify this for me?
8 Answers
Feb 19, 2025
You are right It is a genotype not blood group. The blood group is the phenotype. People with the genotype AO have an A allele and O allele but are classed as blood group A. This is because the O allele does not produce an antigen but the A allele produces the A antigen. Therefore AO genotypes produce just A antigens and so the individual is classed as group A.
Hope that makes sense.
AB parent can only pass off A or B AO parent can only pass of A or O So, the combinations are AA, AO, AB, and BO. AA and AO are both expressed as type A blood because A antigens are present regardless of the O alelle. Similarly, BO is expressed as type B blood because B antigens are still present. The O phenotype type only exists from a OO combination, where no antigens exist. So the possibilities are A, B, AB.
Feb 18, 2025
The only way to know if you are AO is if you have a child that turns out to be an O. This means you give one O gene and the father gives one O gene. O is sort of recessive in that it means there is no A or B antigen on the RBC. There is no way to detect AO or BO by testing only that they will appear to be an A or B blood type.
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RE:
What blood type is ”AO”?
I don’t think it exists, but some people say it does….?
I think they mean this:
People with blood type O have a genotype of “ii,” which are recessive. Blood type A can either have a genotype of “AA” (dominant genes), OR, they can have a combination of “A” and a “i”, which would make “Ai”. This is still blood type A as the “A” is dominant over the recessive “i” gene that makes up blood type O.
I hope this is what they mean.
If one parent has the blood type AA and the other has the blood type OO the offspring have a chance of recieving AO blood
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