Abstract

Several strains of house flies were synthesized that contain males that will produce only male progeny when they are outcrossed to females from most native strains. Males and females from these strains contain male-determining factors (M) on both members of the 3rd pair of chromosomes, and an incompletely penetrant dominant lethal mutation on one chromosome. Females of the strains carry a female-determining factor (F) that is not located on Chromosome 3 and is epistatic to any combination of M factors. The male-producing males have a potential use in genetic control programs for house flies.

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