Genetic Studies of Melanic Color Patterns and Atypical Sex Determination in the Guppy, Poecilia reticulata

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Abstract
Three guppy color patterns, with the unifying characteristic of being composed primarily of melanophores and occurring only in domestic stocks, were subjected to genetic analysis. Each of the patterns (studied in commercial populations) showed single gene inheritance. The patterns were determined by different loci, were sex-linked on both X and Y chromosomes, and were dominantly expressed in both sexes. The Flavus gene (a tail pattern) inhibited the action of tail-fin enlarging genes and the Y-linkage of the Nigrocaudatus II gene (a body pattern) was associated with subnormal vigor and viability. The likely gene order was NiII-Fla-Cp. The occurrence of XX males constituting a quarter of the progeny of an XY male and XX female was also reported.

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