TAILIEUCHUNG - báo cáo khoa học: "Chromosomal analysis of selected lines of Drosophila melanogaster with a new level of bristle canalization Eva"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Chromosomal analysis of selected lines of Drosophila melanogaster with a new level of bristle canalization Eva | Génét. Sél. Evol. 1988 20 1 75-86 Chromosomal analysis of selected lines of Drosophila melanogaster with a new level of bristle canalization Eva GARCÍA-VÁZQUEZ and J. RUBIO Departamento de Biologia Funcional Area de Genética Facultad de Medicina CUulián Claveria sin 33006-Oviedo Spain Summary A new phenotype of extra bristles has been canalized through selection in four lines of D. melanogaster. A chromosomal analysis of these lines has been carried out. All three main chromosomes contribute with strong interactions to the increase in bristle number and chromosome 3 has the highest contribution to this increase. Chromosome 1 and or 2 are instead primarily responsible for bristle canalization in the scutum in these lines. The results are discussed in relation to a proposed genetic model for bristle determination. Key words canalizing selection extra bristles chromosomal analysis Drosophila melano-gaster. Resume Analyse chromosomique de lignées de Drosophila melanogaster présentant un changement du niveau de canalisation des soies Un nouveau phenotype de soies surnuméraires a été obtenu par selection canalisante dans quatre lignées de Drosophila melanogaster. Une analyse chromosomique de ces lignées a été effectuee. Les trois principaux chromosomes contribuent avec de fortes interactions à 1 augmenta-tion du nombre de soies le chromosome 3 ayant la contribution la plus élevée. Les chromosomes 1 et ou 2 sont les principaux responsables de la canalisation des soies scutellaires dans ces lignées. Les résultats sont discutes par rapport à un modèle génétique propose pour rendre compte du déterminisme des soies. Mots clés selection canalisante soles surnuméraires analyse chromosomique Drosophila melanogaster. I. Introduction Scutellar and dorsocentral bristles of Drosophila melanogaster have been widely studied as a model of canalized characters. Practically all the individuals of natural populations have the normal phenotype fig. 1 although some are not canalized and 76

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