キイロショウジョウバエにおける性的隔離の選択〔英文〕

概要

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The aim of the present study was to produce sexual isolation between two mutant strains, brown and ebony, of D. melanogaster with or without X-ray treatment. These two mutant strains were prepared in such a way as to have a nearly common genetic background before selection.A new selection procedure for the collection of the parents for the next generation, which is modified from that of Koopman, was applied. Four hundred flies in total, one hundred females and one hundred males of each of two mutant strains, were put into a population cage for 72 hours or into a population bell for 48 hours. Each female was isolated individually and allowed to lay eggs after the mating period and the type of mating was determined by the progeny test. On the average, about 20 percent of double matings were observed during 72 hours. In this study, progenies from homogamic matings were selected as the parents exclusively. The proportion of females producing wild type progeny was taken as the measure of the sexual isolation.Regression coefficients of frequencies of females which produced wild type progeny in all four selected lines with X-ray treatment were negative, whereas three were positive in four selected lines without X-ray treatment. Selection for sexual isolation may be effective under the conditions of an effective procedure applied and with X-ray treatment producing gene mutations which affect mating preference.
日本遺伝学会の論文