Genetic analysis of geotaxis in Drosophila melanogaster: Complementation between forward and reverse selection lines.

Abstract

The response to artificial selection for geotactic behavior in 4 lines of Drosophila melanogaster was measured. The negative forward line showed continued response to selection beyond Generation 65; the positive forward line did not. The reverse selection lines Obtained nearly the same scores as did the forward lines by Generation 56 of reverse selection. Results of a complementation test between the forward and reverse lines of similar phenotypic expression indicated that genotypes of reverse lines were not the same as genotypes of forward lines, except that males of the negatively scoring reverse selection line were not detectably different from males of the negatively scoring forward line.