This gene controles whether you can se
the tabby pattern or not.
It gives the difference between the non-agouti (self or solid) and the agouti
(the tabby-pattern Tick Tabby, Spotted Tabby, Mackerel Tabby and Blotched/Classic
Tabby.
The agouti dominates the non-agouti.
[AA] and [Aa] is the agouti (you can se
the tabby pattern)
[aa] is the non-agouti (you canot se the tabby patern)