グッピ-の矮小遺伝子の発見〔英文〕

概要

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To elucidate genetic control for the growth of the guppy, size differences between Fancy (F) and Standard (S3) strains and between dwarf and normal in the F strain were examined. The two guppy strains, F and S3, displayed significant differences in growth. The F strain is bigger than the S3 strain in body length at Day 60. Using strain comparison, the heritability (VG/VP) was estimated at 59.2% in females and 38.6% in males. Thus, the strain difference indicates the proportion of genetic determination of the character.Dwarf guppies were found in some of the inbred litter of brother-sister mating of the F strain. An overlap of distributions for body length at Day 60 was observed between F and S3 strains but not between dwarf and normal. From the comparison between dwarf and normal, the heritability was estimated at 88.0% to normal females and 84.5% to normal males. These high values suggest that the dwarf is induced by a single gene with major effects on what is ordinarily growth. A single gene inheritance was supported by the segregation of the dwarf in some of the litter of inbreeding pedigree.
日本水産學會の論文