Genetic Basis of the Variegated Tail Pattern in the Guppy, Poecilia reticulata(Genetics)

概要

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Variegated patterns on the caudal fin are a common and popular trait in guppy strains commercially cultured in Singapore. Gene control of this highly variable mosaic pattern of black spots and patches of different shapes and sizes on a brightly colored tail fin was elucidated by reciprocal crosses between the Green Variegated (GV) strain and wild-type (WT) stock. F_1 progenies were produced by single-pair crossing between GV and WT, while the F_2 generation was obtained from full-sib mating between F_1 males and F_1 females. Data for the F_1, and F_2 generations were segregated according to phenotypes and sex, and tested by chi-square analyses. Inheritance of variegated tail patterns appears to be determined by a single locus on the X- and Y-chromosomes. Genotypes of males and females of the GV strain are proposed to be X_<Var>Y_<Var> and X_<Var>X_<Var>, respectively. The allele for variegated tail patterning, Var, is dominant over that of the wild-type, Var^+, which does not exhibit these patterns. Recombination frequency between the Var locus and sexdetermining region (SdR) in male guppies was estimated to be about 1.9% (map distance ≈ 1.9 map units). The segregation and mode of inheritance of the Var gene are illustrated by genetic models.
社団法人日本動物学会の論文
1999-06-15