title: Lack of response to family selection for directional asymmetry in Drosophila melanogaster: left and right are not distinguished in development.
abstract: Family selection for directional asymmetry in the expression of the Drosophila melanogaster mutant scute had no result. Fluctuating asymmetry did not show a selection differential correlated with directional asymmetry. The unfolding of bilateral symmetry in embryogenesis can be used to explain the lack of genetic variation for directional asymmetry. Directional asymmetry provides a well-understood example of a developmental constraint in evolution. It is proposed that as no evidence is available for an independent left-right gradient in the embryo, quantitative traits can only be expressed variably along an existing gradient of positional information or a morphogen.
authors.affiliation: University of Utrecht, The Netherlands.
authors.forename: E J
authors.initials: EJ
authors.lastname: Tuinstra
authors.forename: G
authors.initials: G
authors.lastname: De Jong
authors.forename: W
authors.initials: W
authors.lastname: Scharloo
mesh_terms: D000818:Animals; D004331:Drosophila melanogaster / Q000235:genetics*; D005260:Female; D007839:Functional Laterality / Q000235:genetics; D005838:Genotype; D008297:Male; D009154:Mutation; D012044:Regression Analysis; D012641:Selection, Genetic