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The Journal of Heredity 1989:80(4):277-283
© 1989 The American Genetic Association 80:277-283

research-article

Inheritance and Linkage Relationships of Allozymes in the Apple Maggot Fly

J. L. Feder, C. A. Chilcote, and G. L. Bush

Dr Feder is now at the Department of Biology, Princeton University Princeton, New Jersey
Mr. Chilcote is now at Department of Natural Resources, University of Michigan Ann Arbor
Department of Zoology, Michigan State University East Lansing

Address reprint requests to Dr. Feder, Department of Biology, Princeton University, Princeton, NJ 08544

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.


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