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1 April 2001 THE Y CHROMOSOMES OF DROSOPHILA SIMULANS ARE HIGHLY POLYMORPHIC FOR THEIR ABILITY TO SUPPRESS SEX-RATIO DRIVE
Catherine Montchamp-Moreau, Valérie Ginhoux, Anne Atlan
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Abstract

The sex-ratio trait, known in several species of Drosophila including D. simulans, results from meiotic drive of the X chromosome against the Y. Males that carry a sex-ratio X chromosome produce strongly female-biased progeny. In D. simulans, drive suppressors have evolved on the Y chromosome and on the autosomes. Both the frequency of sex-ratio X and the strength of the total drive suppression (Y-linked and autosomal) vary widely among geographic populations of this worldwide species. We have investigated the pattern of Y-linked drive suppression in six natural populations representative of this variability. Y-linked suppressors were found to be a regular component of the suppression, with large differences between populations in the mean level of suppression. These variations did not correspond to differences in frequency of discrete types of Y chromosomes, but to a more or less wide continuum of phenotypes, from nonsuppressor to partial or total suppressor. We concluded that a large diversity of Y-linked suppressor alleles exists in D. simulans and that some populations are highly polymorphic. Our results support the hypothesis that a Y-chromosome polymorphism can be easily maintained by a balance between meiotic drive and the cost of drive suppression.

Corresponding Editor: H. A. Orr

Catherine Montchamp-Moreau, Valérie Ginhoux, and Anne Atlan "THE Y CHROMOSOMES OF DROSOPHILA SIMULANS ARE HIGHLY POLYMORPHIC FOR THEIR ABILITY TO SUPPRESS SEX-RATIO DRIVE," Evolution 55(4), 728-737, (1 April 2001). https://doi.org/10.1554/0014-3820(2001)055[0728:TYCODS]2.0.CO;2
Received: 24 May 2000; Accepted: 1 November 2000; Published: 1 April 2001
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KEYWORDS
Drosophila simulans
meiotic drive
sex ratio
Y CHROMOSOME
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