Genetic Studies on the Location of a Chromosome II Gene Conferring Resistance to Parathion in the House Fly12

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Abstract
Genetic tests were performed to determine the order of 3 chromosome II visible recessive mutants in Musca domestica L. and to locate a gene conferring resistance to parathion in relation to the mutants. Crosses between mutant strains and a susceptible wild type strain indicated a gene order of aristapedia-carnation eye-stubby wing. In crosses between mutant strains and the resistant strain, the gene order was R (for resistance)-aristapedia-stubby wing carnation eye. Thus, the gene order was not the same in the 2 sets of crosses. In addition to the change in gene order, the distance between the mutants was reduced in the parathion resistant X mutant crosses. The results indicate that a suppression of crossing over, most probably in the form of an inversion, occurs on chromosome II in the resistant strain. The relationship of this anomaly to resistance is unknown.