Abstract

Construction of “genetic sexing” strains of the Mediterranean fruit fly, Ceratitis capitata (Wiedemann), for use in sterile-insect technique projects, depends on a close linkage of the sexing trait with the male's sex-determining chromosome. Genetic recombination in males was observed for two linkage groups and its possible effects on the linkage of the sexing trait to the male's sex chromosome was studied. A model was developed to evaluate the consequences of recombination in males on the integrity of genetic sexing strains. Actual data suggest that other mechanisms operate in such strains, causing the deterioration and reshuffling of the sexing trait.

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