Inheritance and Linkage Relationships of Allozymes in the Apple Maggot Fly

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Abstract
We established a genetic basis for six newly studied allozyme. in a nondiapausing, laboratory strain of the apple maggot fly, Rhagoletis pomonella, bringing to 18 the number of allozyme loci that have been genetically characterized for this species. We mapped four of the six newly resolved loci to previously known linkage groups. Another locus, Aspartate aminotransferase-1 (Aat-1), was found to be sex-linked and indicated for the first time that males are the heterogametic (XY) sex in R. pomonella. In addition, we observed significant gametic disequilibrium between pairs of linked, nonallelic genes in the laboratory strain. The pattern of linkage disequilibrium for nondiapausing flies was different from that seen in natural populations, suggesting that the laboratory line has become genetically modified during culture.