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Genetics of morphological differences and hybrid sterility between Drosophila sechellia and its relatives

Published online by Cambridge University Press:  14 April 2009

Jerry A. Coyne ,
John Rux  and
Jean R. David
Jerry A. Coyne*
Affiliation:
Department of Ecology and Evolution, The University of Chicago, 1103 East 57th Street, Chicago, Illinois 60637, USA
John Rux
Affiliation:
Department of Ecology and Evolution, The University of Chicago, 1103 East 57th Street, Chicago, Illinois 60637, USA
Jean R. David
Affiliation:
Laboratoire de Biologie et Génétique Évolutives, Centre National de la Recherche Scientifique, 91198 Gif-sur-Yvette Cedex, France
*
* Corresponding author.
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Summary

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We conducted classical genetic analysis of the difference in male genitalia and hybrid sterility between the island-dwelling sibling species Drosophila sechellia and D. mauritiana. At least two loci (one on each autosome) are responsible for the genital difference, with the X chromosome having no significant effect. In contrast, male hybrid sterility is caused by at least four gene loci distributed among all major chromosomes, with those on the X chromosome having the largest effect.

We also show that the large difference in ovariole number between D. sechellia and its mainland relative D. simulans is due to at least two gene substitutions, one on each major autosome. The X and the left arm of the second chromosome, however, have no significant effect on the character. This implies that the evolution of reduced ovariole number involved relatively few gene substitutions.

These results extend previous findings that morphological differences between Drosophila species are caused by genes distributed among all chromosomes, while hybrid sterility and inviability are due primarily to X-linked genes. Because strong X-effects on male sterility have been found in all three pairwise hybridizations among D. simulans, D. sechellia and D. mauritiana, these effects must have evolved at least twice independently.

Type
Research Article
Information
Genetics Research , Volume 57 , Issue 2 , April 1991 , pp. 113 - 122
Copyright
Copyright © Cambridge University Press 1991

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