[pstinard]

Originally Posted by BWRTerrierFan

Here is an explanation of the Parti-Color from another Yorkie Breeder

Goldenray Genetics Party Yorkies Parti Color and Biewer Colors Genetic Studies

Great article! To relate to what I was talking about above, the "S" gene described in the article is the normal, functional MITF gene (found in breed standard Yorkshire Terriers), and the piebald gene is a mutant form of the MITF gene that is now known to have two unique mutations (a SINE DNA insertion, and a length polymorphism) in its regulatory region.