Figure 19. A mutant that fails to respond to multiple stimuli.

At the right end of an 11 cm×70 cm tube were placed two repellents—benzaldehyde and high temperature (38°C)—and at the left end two attractants—light and a favored temperature (29°C). Flies were placed near the repellent end (labeled here “origin”). A) Nearly all the parental flies went to the attractant end (labeled here “furthest”). Mean ± S.E.M. for 7 experiments. B) Mutant flies failed to be repelled or attracted. Mean ± S.E.M. for 4 experiments. Details will be presented elsewhere [Vang et al., “Drosophila mutants that are motile but fail to respond to stimuli” (manuscript in preparation, 2012)].