title: Variable Expressivity of a Mutant Gene in Leopard Frog.
abstract: The genetic distinction between the nonspotted, or burnsi, mutant and the common-spotted, wild-type leopard frog is not simply unifactorial. The burnsi phenotype is a manifestation of genic interaction between a major pigmentary locus and a complex of modifiers (minor genes with small effects).
authors.forename: E P
authors.initials: EP
authors.lastname: Volpe