You can't call this locus the paradigm locus. There is no single mutant gene named paradigm. In genetics, the name of the locus is the same as the symbol for the first mutant at that locus. If the genetics for Sharp albino was worked out before the genetics of caramel hypo, then the locus name would be something like as (for albino - sharp). If caramel hypo was worked out first, then the locus name would be something like ch (for caramel hypo). There is a document spelling out the rules of genetic nomenclature for mice and rats at the Jackson Lab web site. It's not the easiest reading though.

Paul Hollander
Genetic nomenclature

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