Many blood proteins contribute to blood type (Stratton, 1952), and the ABO ... Individuals who are homozygous for the sickle-cell allele (ss), however, may have sickling crises that require ...

The Uchiha family as seen in the anime (Image via Studio Pierrot) As already stated, Sasuke's AB blood type AB contains two components: A (allele) and B (allele), both of which are dominant.