Urethane 에 의한 Polygenic 돌연변이에 관한 연구 = Polygenic Mutations Induced by Urethane in Drosophila Melanogaster

다국어 초록 (Multilingual Abstract)

Seventy second chromosomes with Urethane treatment and the same number of second chromosomes for control test, of Drosophila melanogaster have been analyzed to estimate the genetic variance of sternopleural and abdominal bristle characters and its components by means of a partial diallel cross (Design II of Comstock and Robinson 1952). Mean value of two characters are not affected by Urethane. The genotypic variance in the treated chromosomes are significantly larger than those in the control chromosomes. Genotypic variances are mainly consisted of the additive components for both the treated and control groups. Dominance variance is smaller than error variance in both experiments. The error variances of the treated group for both characters are nearly the same as those of control group. On the basis of these findings, it is suggested that Urethane is a effective polygenic mutagen and the maintenance of polygene mutation for bristle characters are controlled mainly by additive genes.