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Inheritance of seasonal cycles in Chrysoperla (Insecta: Neuroptera)

Published online by Cambridge University Press:  14 April 2009

Catherine A. Tauber  and
Maurice J. Tauber
Catherine A. Tauber
Affiliation:
Department of Entomology, Comstock Hall, Cornell University, Ithaca, N.Y. 14853, USA
Maurice J. Tauber
Affiliation:
Department of Entomology, Comstock Hall, Cornell University, Ithaca, N.Y. 14853, USA

Summary

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Two separate, but interacting, genetic systems underlie the variation in seasonal cycles among members of the Chrysoperla carnea species-complex. The two systems are expressed as all-or-none reproductive responses to photoperiod and prey (i.e. short-day/long-day requirement for reproduction versus long-day reproduction and prey requirement for reproduction versus reproduction without prey). In each case the alternative to reproduction is reproductive diapause. The photoperiodic responses are determined by alleles at two unlinked autosomal loci. The expression of dominance by the alleles at these loci varies among geographical populations. The genes that determine the photoperiodic responses also act as suppressors of the genes that govern responsiveness to prey. An autosomal, polygenic system, with a threshold for the expression of diapause, determines responsiveness to prey. The two genetic systems are important to seasonal diversification and speciation within the C. carnea species-complex.

Type
Research Article
Information
Genetics Research , Volume 49 , Issue 3 , June 1987 , pp. 215 - 223
Copyright
Copyright © Cambridge University Press 1987

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