Effect of coat color mutations on behavioral polymorphism in farm populations of American minks (<Emphasis Type="Italic">Mustela vison</Emphasis> Schreber, 1777) and sables (<Emphasis Type="Italic">Martes zibellina</Emphasis> Linnaeus, 1758)

Behavioral polymorphism estimated by the expression of the defensive reaction towards humans has been studied in farm-bred American minks and sables with different color types. Most animals (both minks and sables) from farm populations displayed passive defensive behavior towards humans in the standard hand catch test. Coat color genes have been found to have pleiotropic effects; they influence both the penetrance and expressivity of domestication behavior: in animals with aberrant color types (both sapphire minks and white-and-black sables), the proportion of animals with domestication behavior and the expressivity of this behavior are significantly higher (p < 0.01 and p < 0.001, respectively).