Independent Origins of New Sex-Linked Chromosomes in the <Emphasis Type="Italic">melanica</Emphasis> and <Emphasis Type="Italic">robusta</Emphasis> Species Groups of <Emphasis Type="Italic">Drosophila</Emphasis> |
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Authors: | Sergio V Flores Amy L Evans Bryant F McAllister |
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Institution: | (1) Department of Biological Sciences & Roy J. Carver Center for Comparative Genomics, 143 Biology Building, University of Iowa, Iowa City, IA 52242, USA |
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Abstract: | Background Recent translocations of autosomal regions to the sex chromosomes represent important systems for identifying the evolutionary
forces affecting convergent patterns of sex-chromosome heteromorphism. Additions to the sex chromosomes have been reported
in the melanica and robusta species groups, two sister clades of Drosophila. The close relationship between these two species groups and the similarity of their rearranged karyotypes motivates this
test of alternative hypotheses; the rearranged sex chromosomes in both groups are derived through a common origin, or the
rearrangements are derived through at least two independent origins. Here we examine chromosomal arrangement in representatives
of the melanica and the robusta species groups and test these alternative hypotheses using a phylogenetic approach. |
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