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=A0<I>Calligraph Chris, How do the unisexual species evolve? Is there some exchange of genetic material between the females or with the closely related species? c.majka@ns.sympatico.ca wrote: . . . . > I'll note, parenthetically, that this genus of beetles is a very > interesting one which has been the subject of considerable recent > genetic research. Most of the species in the genus are normal, diploid, > bisexual species, however, there are four species in the group which are > tetraploid, unisexual (female only) species that reproduce > parthenogenetically. Unisexuality in beetles is a comparatively rare > phenomenon. Recent research has established that these tetraploid > species have resulted from hybridization between two species and > using nuclear and mitochondrial DNA the maternal and paternal "parents" > of these species have been established. They are: . . . . > Most of these species (/philadelphica, alnicola, confluens, rowena, > multipunctata, & scalaris/) are found in the Maritimes, so this region > is a very interesting laboratory of the development and evolution of > this species-rich genus (37 species are found in North America, and > there are many more in neotropical areas).
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