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GENETIC MANIPULATION OF AN ABNORMAL JUMP RESPONSE IN DROSOPHILA
W. D. Kaplan 1 and W. E. Trout 1
1 Department of Biology, City of Hope National Medical Center, Duarte, California 91010
The hyperkinetic mutants, Hk1 and Hk2, jump and fall over when an object moves near them. This behavior, the kinetogenic response, has been measured by the experimenter moving his hand above a vial containing a single fly and scoring the number of positive responses in fifty trials. The response is higher in Hk1 than in Hk2 and has remained so over a period of several years and in different genetic backgrounds. The Hk1/Hk2 heterozygote also responds to movements, establishing the allelism of the two mutants.—When Sh5, a shaker mutant at another locus on the X chromosome, is introduced into the same chromosome as Hk1 or Hk2, the response is reduced in proportion to the number of Sh5 mutant genes added.—When Hk1 or Hk2 is heterozygous with a deficiency for the hyperkinetic region of the X chromosome, the expression is more abnormal than the respective Hk1 or Hk2 homozygote. This shows that the mutant genes are producing an altered gene product, or less of the normal, since one mutant gene by itself has a more abnormal expression than two. A tentative explanation has been offered for the observed mutant behaviors.
Submitted on November 8, 1973Revised on February 21, 1974
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