Selection for and against a canalized phenotype inDrosophila melanogaster
- 1 August 1967
- journal article
- research article
- Published by Hindawi Limited in Genetics Research
- Vol. 10 (1), 21-33
- https://doi.org/10.1017/s0016672300010739
Abstract
Selection for and against the canalized phenotype in scutellar bristles was attempted in two selection lines and a randomly selected line was used as control. The selection lines were the Decanalization line (D) and the Canalization line (N). The D line was maintained by matings of scute males (scwbl) with three scutellars with wild-type females (scwbl/yw) with five bristles, in the N line scute males with four bristles were mated with wild-type females also with four bristles, while in the C line males and females of the above genotypes were selected at random. The lines were established from a sample of flies taken from a line selected for high scutellar numbers.After eighteen generations of selection the C line was characterized by a regression of mean bristle number without appreciable change in variance. Relative to the N line, the D population showed a lower proportion of flies having four scutellars, a higher variance in bristle numbers, and a higher proportion of four-bristle scute flies having abnormal patterns.Two alternative hypotheses were advanced to account for the results of this experiment. The first postulated a relative change in the widths of the four-bristle canalization zones in the selection lines, while the second suggested a relative change in frequencies of specific modifier genes for scutellars in scute and in wild-type genotypes of the lines. The evidence favours the latter hypothesis.This publication has 13 references indexed in Scilit:
- Selection for Canalization of the Scute Phenotype. II.The American Naturalist, 1966
- Selection for Pattern of an Artificially Canalised CharacterThe American Naturalist, 1965
- Bristle Pattern in Scute Stocks of Drosophila melanogasterThe American Naturalist, 1965
- The relationship between gene and phenotypeJournal of Theoretical Biology, 1962
- Selection for Canalization of the Scute Phenotype in Drosophila MelanogasterAustralian Journal of Biological Sciences, 1960
- CANALIZATION OF THE SCUTE PHENOTYPE OF DROSOPHILAEvolution, 1959
- Canalization of the Scute Phenotype of DrosophilaEvolution, 1959
- Selection for an Invariant·Character, Vibrissa Number, in the House MouseAustralian Journal of Biological Sciences, 1959
- GENETIC ASSIMILATION OF AN ACQUIRED CHARACTEREvolution, 1953
- Genetic Assimilation of an Acquired CharacterEvolution, 1953