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A comparison of the genetic basis of wing size divergence in three parallel body size clines of Drosophila melanogaster

Gilchrist, AS; Partridge, L; (1999) A comparison of the genetic basis of wing size divergence in three parallel body size clines of Drosophila melanogaster. GENETICS , 153 (4) 1775 - 1787.

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Abstract

Body size dines in Drosophila melanogaster have been documented in both Australia and South America, and may exist in Southern Africa. We crossed flies from the northern and southern ends of each of these dines to produce F-1, F-2, and first backcross generations. Our analysis of generation means for wing area and wing length produced estimates of the additive, dominance, epistatic, and maternal effects underlying divergence within each dine. For both females and males of all three dines, the generation means were adequately described by these parameters, indicating that linkage and higher order interactions did not contribute significantly to wing size divergence. Marked differences were apparent between the dines in the occurrence and magnitude of the significant genetic parameters. No dine was adequately described by a simple additive-dominance model, and significant epistatic and maternal effects occurred in most, but not all, of the dines. Generation variances were also analyzed. Only one dine was described sufficiently by a simple additive variance model, indicating significant epistatic, maternal, or linkage effects in the remaining two dines. The diversity in genetic architecture of the dines suggests that natural selection has produced similar phenotypic divergence by different combinations of gene action and interaction.

Type: Article
Title: A comparison of the genetic basis of wing size divergence in three parallel body size clines of Drosophila melanogaster
Keywords: TEMPERATURE-RELATED DIVERGENCE, PITCHER-PLANT MOSQUITO, EXPERIMENTAL POPULATIONS, DEVELOPMENTAL TIME, WYEOMYIA-SMITHII, OVARIOLE NUMBER, EPISTASIS, FITNESS, EVOLUTION
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Genetics, Evolution and Environment
URI: http://discovery.ucl.ac.uk/id/eprint/134746
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