in other breeds of dogs (E^m) is also present in Labradors, but since the colour of the mask is determined by the B locus, in Labradors the mask this gene produces is indistinguishable from the overall coat colour.

Eumelanin gene interactions

The interplay between these two genes determines the colour of a Labrador Retriever, and is widely used as an example of epistasis. If a dog possesses the dominant phenotype for the extension allele (genotype EE or Ee), then it will display the fur colouration determined by

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