Genetic variance for body size in a natural population of Drosophila buzzatii.

摘要: Previous work has shown thorax length to be under directional selection in the Drosophila buzzatii population of Carboneras. In order predict genetic consequences natural selection, variation for this trait was investigated two ways. First, narrow sense heritability estimated laboratory F2 generation a sample wild flies by means offspring-parent regression. A relatively high value, 0.59, obtained. Because phenotypic variance 7-9 times that raised laboratory, "natural" may as one-seventh one-ninth value. Second, contribution second and fourth chromosomes, which are polymorphic paracentric inversions, field laboratory. This done with assistance simple model shows among chromosome arrangements karyotypes provide minimum estimates chromosome's additive variances trait, respectively. males optimal conditions second-chromosome accounted 11.43% total most additive; contrast, nonsignificant. The 1.56-1.78% nonsignificant females. 0.14-3.48% flies. At both proportion higher mating than nonmating