Đang chuẩn bị liên kết để tải về tài liệu:
báo cáo khoa học: "Allozyme frequency changes in two inverse sequences of environments in Drosophila melanogaster"
Đang chuẩn bị nút TẢI XUỐNG, xin hãy chờ
Tải xuống
Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Allozyme frequency changes in two inverse sequences of environments in Drosophila melanogaster | Génét. Sél. Evol. 1985 17 1 59-72 Allozyme frequency changes in two inverse sequences of environments in Drosophila melanogaster H. MERỌOT Laboratoứe de Génétique des Populations tour 42 Université Paris 7 2 place Jussieu F 75005 Paris Summary Six replicates of a Drosophila melanogaster population were confronted with 2 sequences of 3 different environments to wit 3 replicates with the environmental sequence E1-E2-E3 characterizing the Hl history and 3 replicates with the inverse sequence E3-E2-E1 characterizing the H3 history. The 6 replicates maintained in population cages were exposed to each environment for 5 discrete generations. Changes in allozyme frequencies at 4 loci were analysed to detect whether the changes depended upon the order of succession of the 3 environments. This was only the case for one locus Adh but not for Est-6 and Pgm and can be related to the sensitivity of the Adh locus to environmental diversity. For the last locus a-Gpdh the substantial heterogeneity between replicates within each history seems to be due to a hitchhiking effect. The diversity of the observed evolutionary profiles more important between loci for a same history than between the 2 histories for a same locus seems to point to a set of genetic interactions peculiar to each locus. Key-words Environmental diversity enzyme polymorphism Drosophila melanogaster partition of X2- Résumé Variations de frequences allozymiques dans deux series inverses d environnements chez Drosophila melanogaster Trois répliques d une population de Drosophila melanogaster ont été confrontees à une sequence de 3 environnements differents caractérisant 1 histoire Hl. Simultanément 3 autres répliques de cette population ont été confrontees à la sequence inverse des 3 envi-ronnements caractérisant 1 histoire H3. Les 6 répliques ont été gardées en cage à population 5 generations discretes par environnement. A 1 aide de la methode de decomposition du X2 les variations de frequences allozymiques à 4 locus