Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: A genetic evaluation of male reproductive fitness at early and late age in Drosophila melanogaster treated with | Genet Sei Evol 1993 25 421-434 Elsevier INRA 421 Original article A genetic evaluation of male reproductive fitness at early and late age in Drosophila melanogaster treated with a mutagen T Bjorklund G Engstrom LE Liljedahl Swedish University of Agricultural Sciences Department of Animal Breeding and Genetics Box 7023 S-750 07 Uppsala Sweden Received 26 February 1992 accepted 2 June 1993 Summary - The effect of ethyl methane sulfonate-induced mutations in different germ cell stages on male reproductive fitness at early and late age compared to an untreated control was investigated in a laboratory population of Drosophila melanogaster. Indication of active DNA repair processes after mutagen treatment was obtained in the pre-meiotic germ cell stages. Genetic parameters for the male fitness trait ie number of progeny were estimated in a succession of different broods at early and late ages. Heritability estimates for progeny size were found to vary between and in the different brood stages and over the 2 treatment groups. The estimates of genotype-environment interaction as well as genetic correlations suggest that the genetic determination of progeny size is different at an early age between EMS-treated and untreated individuals but not at late ages. reproductive fitness Drosophila melanogaster genetic parameter ageing mutagen Resume Evaluation génétique des capacités de reproduction de males de differents ages exposes à un agent mutagène chez Drosophila melanogaster. Les effets des mutations induites par 1 éthyl methanesulfonate EMS au cours des differentes phases de la gamétogenèse sur la capacité de reproduction de males jeunes OU âgés ont été étudiés sur une population de laboratoire de Drosophila melanogaster. Des processus actifs de reparation de I ADN après traitement par I EMS existent vraisemblablement au Cours des phases préméiotiques. Les paramètres génétiques relatifs au nombre de descendants par male ont été estimés dans plusieurs series de .
