Linkage data and revised genetic maps for 72 autosomal loci in Lucilia cuprina are presented. Comparison of the linkage relationships of biochemically and morphologically similar mutations in Ceratitis capitata, Drosophila melanogaster, and Musca domestica supports the hypothesis that the major linkage elements have survived relatively intact during evolution of the higher Diptera. The relationship of the linkage groups of the mosquito Aedes aegypti to these species is less clear.
Frequency-dependent selection at the diazinon resistance locus of the Australian sheep blowfly, Lucilia cuprinaThe egg to adult viability of susceptibles (SS) at the diazinon resistance locus of L. cuprina was facilitated by RS in mixed (1: 1) cultures at diazinon concentrations greater than O•0002 per cent (W/V) in the concentration range O-OOOO53 per cent (W/V). SS survived in mixed culture at concentrations lethal to pure cultures of this genotype. The egg to adult viability of RS was not influenced by the presence of SS.Trials at 0 per cent and 00002 per cent (W/V) diazinon showed the viability of both genotypes decreased in the presence of diazinon and with increasing density. Viability of RS was independent of its frequency in mixed culture but SS viability was enhanced at frequencies 20 per cent at the 00002 per cent (W/V) concentration. There was no indication of density x frequency interaction.
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