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HIGH MUTABILITY IN MALE HYBRIDS OF DROSOPHILA MELANOGASTER
Michael J. Simmons 1, Nancy A. Johnson 1, Thomas M. Fahey 1, Sue M. Nellett 1, and John D. Raymond 1
1 Department of Genetics and Cell Biology, 250 Biological Sciences Center, University of Minnesota, St. Paul, MN 55108
The frequencies of sex-linked lethal mutations arising in hybrid male offspring from various crosses and in nonhybrid controls were determined. The hybrids were produced by crossing representative strains of the P-M system of hybrid dysgenesis in all possible combinations. Males from the cross of P males x M females had a mutation rate about 15 times higher than that of nonhybrid males from the P strain. Genetically identical males from the reciprocal cross had a mutation rate 3 to 4 times that of the nonhybrids. For crosses involving a Q strain, a significant increase in the mutation rate was detected in males produced by matings of Q males with M females. No increase was observed in genetically identical males from the reciprocal mating. Crosses between P and Q strains gave male hybrids with mutation rates not different from those of nonhybrids. Many of the lethals that occurred in hybrids from the cross of P males x M females appeared to be unstable; fewer lethals that arose in hybrids from the cross of Q males x M females were unstable. The relationship between P and Q strains is discussed with respect to a model of mutation induction in dysgenic hybrids.
Submitted on June 5, 1980
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