Blood type classification uses the ABO system. This system determines blood type based ... To have blood type O, you must inherit two O alleles—one from each parent, since O doesn't produce any ...

In cases of questioned paternity, ABO blood-typing can be used to exclude a man from being a child's father. For example, a man who has type AB blood ... specific marker alleles, rather than ...

An example of codominance occurs in the human ABO blood group system. Many blood proteins contribute to blood type (Stratton ... There are three common alleles in the ABO system.