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Identification of a male determinant on the X chromosome of housefly (Musca domestica L.) populations in South-East England

Published online by Cambridge University Press:  14 April 2009

I. Denholm ,
M. G. Franco ,
P. G. Rubini  and
M. Vecchi
I. Denholm
Affiliation:
Department of Insecticides and Fungicides, Rothamsted Experimental Station, Harpenden, Herts. AL5 2JQ, England
M. G. Franco
Affiliation:
Dipartimento di Biologia Animale, University of Pavia, P. Botta 9, 27100 Pavia, Italy
P. G. Rubini
Affiliation:
Dipartimento di Biologia Animale, University of Pavia, P. Botta 9, 27100 Pavia, Italy
M. Vecchi
Affiliation:
Dipartimento di Biologia Animale, University of Pavia, P. Botta 9, 27100 Pavia, Italy

Summary

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Houseflies collected from eight pig-breeding farms were used to investigate the nature of sex determinants in fly populations of South-East England. Earlier observations had shown that their sex determination mechanism was not of the standard (XX females, XY males) type.

Most flies of both sexes were XX; the male determining Y chromosome of standard populations was rare. Test-crosses to females of standard multimarked strains and crosses using aneuploid (OX) flies identified two dominant male determinants, one on autosome 3 (M III) and another on the X chromosome (Xm), and provided the first demonstration in this species of an active involvement of the X chromosome in sex determination. A small secondary constriction on X appeared to indicate reliably the presence of Xm. Most individuals in field populations were Xm homozygotes, implying the presence of an unlocated female determinant F,† epistatic to Xm and M III.

M III was less common and differed in frequency between samples. Its increased frequency in a strain selected in the laboratory with the pyrethroid insecticide permethrin might be due either to genetic drift, or to linkage between M III and a gene on autosome 3 that confers resistance to pyrethroids in houseflies.

Type
Research Article
Information
Genetics Research , Volume 42 , Issue 3 , December 1983 , pp. 311 - 322
Copyright
Copyright © Cambridge University Press 1983

References

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