tailieunhanh - báo cáo khoa học: "The analysis of quantitative variation in natural populations with isofemale strains"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: The analysis of quantitative variation in natural populations with isofemale strains | Génét. Sét. Evol. 1988 20 1 87-98 The analysis of quantitative variation in natural populations with isofemale strains . HOFFMANN and . PARSONS Department of Genetics and Human Variation La Trobe University Bundoora 3083 Victoria Australia Summary Isofemale strains are having an increasing role in the analysis of variability of ecological and behavioural traits in natural populations. This paper therefore considers the association between heritability and phenotypic variation within and between isofemale strains. Heritability from an isofemale strain analysis approximates narrow heritability over a wide range of dominance values particularly when genes contributing to variation in a trait are at intermediate frequencies. Meaningful heritability estimates require that isofemale strains are maintained at a population size greater than 50 and tested within 5 generations after establishment. Values of heritabilities for morphological traits in Drosophila melanogaster were similar to those estimated from a conventional sib analysis. Published data on isofemale strains can therefore be put into a theoretical framework. The contribution of isofemale strain analyses to the debate about the number of loci affecting variation in quantitative traits is briefly discussed. Keys words isofemale strain heritability Drosophila melanogaster gene number morphological trait. Résumé Analyse de la variabilité quantitative dans des populations naturelles par des lignées isofemelles Les lignées isofemelles jouent un role croissant dans 1 analyse de la variabilité des caractères écologiques et comportementaux dans les populations naturelles. Cet article a trait aux relations existant entre rhéritabilité et la variation phénotypique intra et entre lignées isofemelles. L herita-bilité obtenue par analyse de lignées isofemelles constitue une approximation de 1 héritabilité au sens étroit pour une large gamme de valeurs de dominance en particulier lorsque les genes contribuant à la .

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