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A flight test box was developed and used in the isolation and initial characterization of Drosophila melanogaster mutants defective in flight behavior. Forty-eight mutants were isolated from F1 progeny of ethyl methanesulfonate-treated males. Genetic mapping and complementation tests show that the mutations reside at thirty-four different sites on the X chromosome. Different mutants show different degrees of flight ability compared to controls. Forty-six mutations are recessive, while two appear to be semi-dominant with respect to flight behavior. In addition to flight defects, five mutants have visible defects, five behave as temperature-sensitive lethals and three exhibit abnormal electro-retinograms. Alleles of each of the previously known behavioral mutations, Hyperkinetic, ether à go-go and Shaker were found. Preliminary studies also suggest that the flight behavioral phenotype of mutations at seven sites is affected by the temperature at which the flies develop.

BEHAVIORAL MUTANTS OF DROSOPHILA MELANOGASTER. I. ISOLATION AND MAPPING OF MUTATIONS WHICH DECREASE FLIGHT ABILITY