Sign of taxis as a property of the genotype.
Previous studies have assumed Drosophila to be negatively geotactic and found this to be the case. New methods of observation now yield a spectrum of geotactic behavior both positive and negative. Two-way selection produces races of animals performing in diametrically opposite fashion to the same stimulus conditions.
D000818:Animals; D004330:Drosophila; D005823:Genetics; D005824:Genetics, Behavioral; D005838:Genotype; D012641:Selection, Genetic
GENETICS