tailieunhanh - Báo cáo sinh học: "Ethanol and acetic-acid tolerances in Drosophila melanogaster: similar maternal effects in a cross between 2 geographic races"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Ethanol and acetic-acid tolerances in Drosophila melanogaster: similar maternal effects in a cross between 2 geographic races | Genet Sei Evol 1994 26 29-37 Elsevier INRA 29 Original article Ethanol and acetic-acid tolerances in Drosophila melanogaster similar maternal effects in a cross between 2 geographic races M Chakir1 p Capy1 E Pla1 J Vouidibio2 JR David1 1 CNRS Laboratoire de Biologie et Génétique Evolutives 91198 Gif-sur-Yvette France 2 Faculte des Sciences Laboratoire de Biologie des Populations Brazzaville Congo Received 3 March 1993 accepted 14 October 1993 Summary Ethanol and acetic-acid tolerances were studied in a cross between 2 geographic races of Drosophila melanogaster ie a very sensitive population from equatorial Africa and a resistant French population. Average values in the Fl and F2 were similar and close to the mid-parent value. A clear maternal genotype effect was however observed for both traits between reciprocal F1S and the difference disappeared in the F2. Further investigations demonstrated that for ethanol tolerance the large difference between the parental strains was not entirely due to differences in their allelic frequencies at the Adh locus. The possible mechanisms of these physiological variations are discussed. ethanol tolerance acetic-acid tolerance ADH polymorphism maternal genotype effect geographic races Resume Tolerances à 1 éthanol et à 1 acide acétique chez Drosophila melanogaster effets maternels similaires dans un croisement entre 2 races géographiques. Les tolerances à 1 éthanol et à I acide acétique ont été étudiées à partir d un croisement entre 2 races géographiques de D melanogaster une population très sensible d Afrique équatoriale et une population frangaise résistante. Les valeurs moyennes des generations Fị et Fl sont semblables et proches de la valeur du parent moyen. Une difference nette due au genotype matemel a été observée entre les F1 réciproques. Cette difference disparaĩt en F2. D autres experiences ont montré que pour la tolerance à 1 éthanol la grande difference observée entre les souches parentales n est pas entièrement .