High divergence among Drosophila simulans mitochondrial haplogroups arose in midst of long term purifying selection.

Abstract excerpt

We characterize the type of selection acting within and among mitochondrial lineages in five closely related Drosophila species. We focus on D. simulans, where three genetically distinct mitochondrial haplogroups show high interhaplogroup divergence and low intrahaplogroup polymorphism. Using maximum likelihood models we find that the branches leading to these three distinct mitochondrial groups show a...

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