{A serious exception into the good masking in the tabby pattern exists, as the O allele of your O/o locus is epistatic over the aa genotype. That may be, in purple or product coloured cats, tabby marking is exhibited whatever the genotype within the agouti locus. Image By: Linn Currie, https://waylonkuzdi.ja-blog.com/34092106/grooming-care-needs-for-dummies