Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Chromosomal assignment of the genetic factor, tu-91k, responsible for a melanotic tumour in the Drosophila melanogaster adult female | 561 Genet Sei Evol 1992 24 561-565 Elsevier INRA Note Chromosomal assignment of the genetic factor tu-91k responsible for a melanotic tumour in the Drosophila melanogaster adult female K Kosuda Josai University Faculty of Science Biological Laboratory Sakado Saitama 350-02 Japan Received 3 March 1992 accepted 5 August 1992 Summary - Chromosomal transfer experiments were carried out to assign tu-91k the genetic factor responsible for the organ-specific and female-limited adult melanotic tumour in Drosophila melanogaster. It was found that the second chromosome has a predominant effect and tu-fflk is semidominant in its phenotypic expression. melanotic tumour Drosophila melanogaster I chromosome assignment semidominance Resume - Assignation chromosomique du facteur génétique tu-91k responsable du développement d une tumeur mélanique chez la femelle de Drosophila melanogaster. Des experiences de transfert chromosomigue ont été réalisées en vue d assigner le facteur génétique tu-91k responsable d une tumeur mélanique specifique d un organe et limitée à la femelle adulte de Drosophila melanogaster. Il a été trouvé que le deuxième chromosome a un effet predominant et que tu-91k est semi-dominant dans son expression phénotypique. tumeur mélanique Drosophila melanogaster I assignation chromosomique semidominance INTRODUCTION Many different melanotic tumour strains have been described in Drosophila and other insects since Bridges 1916 first reported one in Drosophila melanogaster but only in a rather small portion have the tumour genes been analysed in detail Gateff 1978 1982 Sparrow 1978 . Many of the difficulties of analysing melanotic tumour mutants stem from the fact that the phenotype is very variable and they often have 562 K Kosuda low penetrance. In previous papers Kosuda 1990 1991 reported a new melanotic tumour strain C-104 in D melanogaster in which the penetrance is rather high. The tumour in the C-104 strain has several unique characteristics Kosuda 1991 . As .
