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The Journal of Heredity 1986:77(6):394-398
© 1986 The American Genetic Association 77:394-398

research-article

Breakpoint distribution in male-linked translocations in Anopheles stephensi Liston

A. S. Robinson, C. Malcolm, P. Groenestijn, and G. Schelling

The authors are affiliated with the Insect Genetics Unit, Research Institute ITAL, P.O. Box 48, 6700 AA Wageningen, The Netherlands. The research was financially supported by the Dutch Ministries of Agriculture and Fisheries, Development Aid and Science Policy. Research was carried out in the form of a joint program INAL (Insect Genetics Unit at Wageningen and three Parasitology Departments in Nijmegen, Amsterdam, and Leiden). Dr. Jack Seawright is thanked for his comments.

Dr. Malcolm's present address: The London School of Hygiene and Tropical Medicine, Keppel Street, London WCIE 7HT, United Kingdom.

Abstract

A series of translocations involving the male chromosome and chromosome 3 was analyzed in Anopheles stephensl. Using three genetic markers In 3R, namely sp, dp, and Bl, the recombination distance between the breakpoint and each of the three markers was assessed. On the basis of control recombination it was possible to assign the breakpoint to the chromosome relative to the three markers. It was shown that the majority of breakpoints were located in the vicinity of dp-Bl and translocations were identified that showed complete linkage with each of the markers. The results are compared with the published data on radiation-induced breakage and used to interpret the difficulties that have been experienced in producing a genetic sexing system in this species.


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