Are white markings caused by a separate gene?

[Sugar Plum]

I've yet to find any white markings (socks, stomach, etc.) on Rafaela Puff. Do some tabbies not have them? She's grey.

Is there more than one gene at work, like for socks, tuxedo, a white stomach, etc.? All of our previous cats with *any* tabby markings have also had white somewhere, most commonly socks and a white stomach.

Thank you very much! I'm just curious.

 

[lutece]

White markings are caused by a dominant gene called "white spotting." Cats with just one copy of the white spotting gene typically have a small to medium amount of white (such as white socks, chest, and tummy). Cats with two copies of the white spotting gene may have lots of white on them, even mostly white with just a few spots of color.

http://www.bioinf.uni-leipzig.de/Leere/SS15/TheoB/CatCoatColor.pdf

White spotting in the domestic cat (Felis catus) maps near KIT on feline chromosome B1

Five feline-derived microsatellite markers were genotyped in a large pedigree of cats that segregates for ventral white spotting. Both KIT and EDNRB cause similar white spotting phenotypes in other species. Thus, three of the five microsatellite markers ...

www.ncbi.nlm.nih.gov

 

[Willowy]

Yes the white markings are a separate co-dominant gene. I think this explains it pretty well: Cat coat genetics - Wikipedia

 

[Sugar Plum]

Thank you for the links!