Tabby/Bicolor

The A Locus contains both the Tabby genes, and the Bicolor pattern. If a cat is genetically bicolor but has two copies of the same color gene,
and is not partially diluted, it will be a "False Self" and appear as one color. The order of dominance in these genes is A > Ab > a > ab.
a_ - Solid Self
A_ - Solid Tabby
Ab_ - Bicolor Tabby
abab - Bicolor Self