tailieunhanh - báo cáo khoa học: "Effect of alcohol and competition levels on viability of eye colour mutants of Drosophila melanogaster"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Effect of alcohol and competition levels on viability of eye colour mutants of Drosophila melanogaster | Génét. Sél. Evol. 1985 17 3 331-340. Effect of alcohol and competition levels on viability of eye colour mutants of Drosophila melanogaster Carmen NÁJERA and . MÊNSUA Departamento de Genetica. Faculdad de Ciencias Biologicas Universidad de Valencia 50 Dr. Moliner Burjassot Valencia Spain Summary In order to test the influence of ethanol on viability of eye mutant strains from a cellar population a factorial analysis was carried out for each mutant using 4 alcohol concentrations 2 levels of competition and 3 genotypes. The competition level-alcohol concentration interaction gives rise to better viability in the mutant strains especially in the heterozygotes. It seems that eye colour mutants have a better viability in the special conditions of the cellar which could explain their high frequency in this habitat. Key words D. melanogaster viability ethanol competition level eye colour mutant. Resume Effet de I alcool et de la surpopuỉation sur ỉa viabilité de mutants de la couleur des yeux de Drosophila melanogaster Pour étudier 1 influence de 1 éthanol sur la viabilité de souches mutantes pour la couleur des yeux et extraites d une cave à vin une analyse factorielle a été réalisée pour chaque mutant avec 4 concentrations d alcool 2 niveaux de competition larvaire et 3 genotypes. L interaction alcoool-surpopulation conduit à une meilleure viabilité des souches mutantes spécialement pour les heterozygotes. Il semble que les mutants ont une meilleure viabilité dans 1 environnement particulier des caves ce qui peut expliquer leur frequence élevée dans cet habitat. Mots clés D. melanogaster viabilité éthanol surpopulation mutants de couleur des yeux. I. Introduction The selectionist versus neutralist controversy on the maintenance of gene variation in natural populations has been debated for many years see reviews of Lewontin 1974 Nei 1975 . 332 c. NÁJERA . MÉNSUA From a selective point of view there are several proposed explanations which are not mutually exclusive.