Linkage data and revised maps for 52 autosomal loci in L. cuprina are presented. Examination of the linkage relationships of biochemically and morphologically similar mutations in L. cuprina, Musca domestica L. and Drosophila melanogaster (Mg) suggests that the major linkage groups have survived largely intact during the evolution of the higher Diptera.
The administration of dieldrin in the larval diet of Lucilia cuprina (Wied.) killed susceptible females with no pre-emergence mortality of males in a strain which contained a Y-autosome translocation linking dieldrin-resistance to the male sex. Laboratory assays of flight activity, sexual competitiveness and visual sensitivity revealed no significant differences between treated and untreated males. The life-span of treated males was slightly reduced at the highest dieldrin concentration used. In field releases, however, the recapture rate of treated males was much lower than for untreated males, indicating a major deficiency in the performance of dieldrin-treated males in the field that was not suspected from the laboratory tests.
Viable and fertile Y-linked duplications have been recovered in Lucilia cuprina for autosomal segments ranging in size from 2-12% of the autosomal polytene chromosome complement. No viable deficiency in this size range was recovered. Survival to adulthood of the duplications decreased with increasing duplication size. Genetic background also influenced recovery of some duplications. Recovery of duplications from fertile duplication-male parents was frequently much higher than from translocation-male parents, possibly due to low adjacent-1 segregation in some translocations or to meiotic-drive-type events. Chromosome 4R may contain a triplo-lethal locus. The use of sex-linked duplications in female-killing systems for genetic control programs may have considerable advantages over reciprocal sex-linked translocations, both in terms of fertility and strain stability.
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