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The Journal of Heredity 1978:69(5):337-340
© 1978 The American Genetic Association 69:337-340

research-article

Genetic variability in the German cockroach

XI. Does chromosome 9 carry remnants of a primitive gene system?

MARY H. ROSS, and CLIFFORD B. KEIL

The authors are associate professor and graduate research assistant, respectively, in the Department of Entomology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061

Abstract

A new mutant, miniature-wing (min), is described and mapped within the region of I map unit that separates the stumpy (sty) and prowing (Pw) loci on chromosome 9 of the German cockroach. Similarities in morphology and maternal-effect lethality suggest that tight linkage of mm with sty may be due to a similarity in gene function and/or time of action. An epistatic effect of min/+ on T(9;1O)Pw adults provides evidence that prowing, a prothoracic wing-like structure, is controlled by the developmental pathway that produces wings on the other thoracic segments. It is suggested that 1) this developmental pathway, as expressed by different genes in ancestral insects, resulted in the formation of paranotal lobes, and 2) that the loss of paranotal lobes during the course of evolution resulted from a suppressor mutant such as apparently resides at the Pw+locus in B. germanica. The entire series of chromosome 9 loci, both female-sterile mutants and two that apparently result in the expression of primitive developmental pathways, may be a remnant of a primitive gene arrangement.


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