Inheritance models of North American red fox coat color

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Abstract
The monohybrid and two dihybrid models of red fox (Vulpes vulpes) coat-color inheritance were evaluated using phenotypic frequency data available in the fur trade literature. The monohybrid model fit 62% (N = 21) of the samples from the Northwest Territories and the insular and coastal parts of Alaska. The Warwick – Hanson (allelic interaction) and modified Iljina (dominance modifier) models fit 97% (N = 133) of the samples from other regions. We favor the Warwick – Hanson model over the modified Iljina (Haldane) model with its restrictive assumption that the B locus is fixed for single allele. The results of some of Iljina's experiments suggest that a part of her silver-phase breeding stock was misidentified as to phenotype. If that was the case, a modifier locus is obviated and the Iljina model is identical with that of Warwick and Hanson.

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