Interallelic interaction between the autosomal Blond and the sex-linked Nigrocaudatus gene in the guppy (Poecilia reticulata)

The paper presents results on guppy genetics, from the project CEEX 140/2006. The sexlinked Nigrocaudatus gene is dominant to its wild alleles and epistatic to all the non-allelomorphic genes affecting posterior body color. Autosomal Blond gene is recesive to its wild allele and is expressed in homozygote form only. In this form, it partially suppresses both the Nigrocaudatus and other melanistic genes due to a low level of melanin synthesis. Other body and fin color traits than melanistic ones (blue, green, red-orange, yellow etc) are expressed at normal intensity in blond varieties.