Both A and B alleles are dominant over O. As a result, individuals who have an AO genotype will have an A phenotype. People who are type O have OO genotypes. In other words, they inherited a recessive O allele from both parents.
What does AO mean in blood type?
AO = A blood type. BB = B blood type. BO = B blood type. OO = O blood type.
Why is O negative so rare?
People with O negative blood often wonder how rare their blood is since it is always in demand by hospitals and blood centers. … Only about 1 in 67 have B negative blood, making it rarer. However, the rarest blood type in the world is Rh-null, which is so rare most of us have never heard of it.
What blood type lives the longest?
Life Span. Chances are higher you’ll live longer if you have type O blood. Experts think your lowered risk of disease in your heart and blood vessels (cardiovascular disease) may be one reason for this.