The Genetic Evidence of a Multiple (Triple) Allelomorph System in Bruchus and Its Relation to Sex-Limited Inheritance.

This paper concerns the origin and genetic hehavior of thrtc body color mutations, which have manifested themselves in my cultures of the so-called "four-spotted cowpea-weevil," Brll(/Jus quadri",o(ulalus, Fahr. The wild type (male and female) have tan body and e~ytral color. The first mutation observed was a red body color dominant to the wild type. This mutation although it was transmitted by both sexes regardless of the previous combination 'manifested a marked sexual dimorphism; the females appear with red· elytra and body color but the males are of the wild type (tan body and elytral color). The second mutant female was 'black and was likewise sex-limited in behavior because the female in pure cUltures were always black while the males were always of the wild type (tan). Both ~es carried the same genes regardless-Of the nature of the cross. Black was dominant to tbe wild tyPe, (taD) bUt'recessive to.red. The third mutation to be considHed in dUa' paJ)ft was a·, white "female. .After pure Jines had betn isolated, it ~waS discovered that, tbe females had always a white body and