TAILIEUCHUNG - Báo cáo sinh học: "Analysis of larval behaviours underlying the pupation height phenotype in Drosophila simulans and D melanogaster"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh Original cung cấp cho các bạn kiến thức về sinh học đề tài: Analysis of larval behaviours underlying the pupation height phenotype in Drosophila simulans and D melanogaster. | Genet Sei Evol 1997 29 589-600 @ Elsevier Inra 589 Original article Analysis of larval behaviours underlying the pupation height phenotype in Drosophila simulans and D melanogaster p Casares MC Carracedo L Garcia-Florez Departamento de Genetica Facultad de Medicina Julian Claveria s n 33071 Oviedo Spain Received 21 October 1996 accepted 27 August 1997 Summary - Lines of Drosophila melanogaster and D simulans previously selected for increased and decreased pupation height have been investigated for larval correlated responses to selection. Larvae of all lines and species showed higher pupation sites when humidity increased from 40 to 100 RH. Pupation height measured in light and in dark revealed that only one out of the nine lines changed its phototactic behaviour during selection. In both species the high pupation lines showed greater mobility than the corresponding controls. Selection for high pupation sites diminished the digging behaviour in D simulans but not in D melanogaster whereas selection for low sites augmented the percentage of digging in D melanogaster. A different correspondence between pupation height and gravity response was found in each species. In D simulans low lines were geopositive and high lines neutral while low lines were neutral and high lines geonegative in D melanogaster. The results indicate that pupation height is a complex trait determined by other simpler behaviours so that a given phenotype can be produced by different genetic systems. This question stresses the difficulty of deducing on biological grounds the meaning of the genetic architecture of a complex behavioural trait whose underlying basic mechanisms are unknown. artificial selection complex behavioural trait I correlated response larval pupation height I Drosophila Resume Analyse des comportements larvaires pour la hauteur de pupaison chez Drosophila simulans et D melanogaster. Les réponses larvaires liées à la selection ont été analysées dans des lignées de Drosophila .

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