By P. D. Evans, V. B. Wigglesworth

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Jennings, K. , Starratt, A. N. and Steele, R. W. (1983). The effects of insecticides M O D E L N E U RO PE PTI DE 27 containing the thionophosphoryl group on peptide neurotransmitter action in the hindgut of Periplaneta americana. Pest. Biochem. Physiol. 19,122-132. Keshishian, H. and O’Shea, M. (1985a). ’J. Neurosci. 5(4), 992-1004, Keshishian, H. and O’Shea, M. (1985b). The acquisition and expression of a peptidergic phenotype in the grasshopper embryo. J. Neurosci. 5(4), 1005-15. Kingan, T. G.

Many investigations have been devoted to the morphological and cytological aspects of this event, which will be briefly summarized here. For more detailed information, the reader is referred to the reviews by Telfer (1975) and Telfer et al. (1982). Insect eggs are large because of their heavy vitellus. The amount of cytoplasm in the egg is small, and is mostly concentrated in its cortex. It contains glycogen, RNA and sometimes DNA.

This operation did not modify the sexual development of either the females or males operated during the 5th or late in the 4th instar, but in the males operated early in the 4th instar, the gonads underwent feminization. Therefore, at least in Lampyris, male sexual differentiation depends on two hormones: an androgenic hormone from the testes, probably produced in the apical tissue, and a neurohormone from the pars intercerebralis, which triggers apical tissue differentiation. As was done for the early investigations of non-genetic sex determination in Lyrnantria, GryZZus and Orgyia, several attempts were made t o confirm the data for Lampyris by exploring other species.

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