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

Theodore Homyk Jr. ¹ and David E. Sheppard ¹

¹ Department of Zoology, The University of British Columbia, Vancouver, B.C., V6T 1W5, Canada

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.

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