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Fitness landscapes support the dominance theory of post-zygotic isolation in the mussels Mytilus edulis and M. galloprovincialis ArchiMer
Bierne, Nicolas; Bonhomme, Francois; Boudry, Pierre; Szulkin, M; David, Pierre.
We studied the genetic basis of post-zygotic isolation in the marine mussels Mytilus edulis and Mytilus galloprovincialis. Evidence was obtained for a high number of recessive Dobzhansky-Muller substitutions in the genome of these two mussel taxa. We analysed the segregation of unlinked diagnostic markers in the progeny of two backcrosses and an F-2 cross, 36 h and 200 days after fertilization. Directional selection favouring M. galloprovincialis genotypes was observed in both kinds of cross. In the F-2, epistatic interactions between each pair of chromosome fragments mapped by the markers were identified in addition. Our results imply that homozygous-homozygous interactions are required for breakdown of coadaptation, in accordance with the dominance...
Tipo: Text Palavras-chave: Mytilus; Dobzhansky Muller incopatibilities; Post zygotic isolation; Negative epistasis; Hybrid breakdown; Hybrid zone.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1350.pdf
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