Blood Types Tutorial
The Human ABO markers: The A, B, and O alleles
Human blood type is determined by co-dominant alleles. An allele is one of several different forms of geneticinformation that is present in our DNA at a specific location on a specific chromosome.Blood Types
There are three different alleles for human blood type
Blood types | For simplicity, we call these |
IA | A |
IB | B |
i | O |
Genotypes
Each of us has two ABO blood type alleles, because we each inherit one blood type allele from our biological mother and one from our biological father. A description of the pair of alleles in our DNA is called the genotype.
Since there are three different alleles, there are a total of six different genotypes at the human ABO genetic locus.
Allele from Parent 1 | Allele from Parent 2 | Genotype of offspring | Blood types of offspring |
A | A | AA | A |
A | B | AB* | AB |
A | O | AO | A |
B | A | AB* | AB |
B | B | BB | B |
B | O | BO | B |
O | O | OO | O |
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