期刊
AMERICAN NATURALIST
卷 169, 期 1, 页码 29-37出版社
UNIV CHICAGO PRESS
DOI: 10.1086/509941
关键词
intralocus conflict; sexual dimorphism; Drosophila melanogaster; experimental evolution; genetic constraints
Theory predicts that intralocus sexual conflict can constrain the evolution of sexual dimorphism, preventing each sex from independently maximizing its fitness. To test this idea, we limited genome-wide gene expression to males in four replicate Drosophila melanogaster populations, removing female-specific selection. Over 25 generations, male fitness increased markedly, as sexually dimorphic traits evolved in the male direction. When male-evolved genomes were expressed in females, their fitness displayed a nearly symmetrical decrease. These results suggest that intralocus conflict strongly limits sex-specific adaptation, promoting the maintenance of genetic variation for fitness. Populations may carry a heavy genetic load as a result of selection for separate genders.
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