They've found the gene that acts as a switch and determines whether your kitty is tabby or not. It's the Dickkopf 4 (Dkk4) gene.
In Abys and other ticked cats, it's mutated, which explains how ticking can be so reliably bred for.
The next step is to look at how this gene works in other felines, which might lead to...
...an actual explanation for How the Leopard Got His Spots.
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