Elements R1 and R2 are subject to the same recombinational forces that give rise to the concerted evolution of the rDNA units. Molecular phylogenetic analysis of elements from 16 Drosophila species suggests these elements have been stable components of the rDNA locus for the 50-70 million year history of the Drosophila genus.
A Dper\R1-element has been sequenced and compared with the R1-elements of a number of other Drosophila species. Phylogenetic analysis suggests that the R1-elements have been vertically transmitted since the inception of the Drosophila genus.
Elements R1 and R2 are subject to the same recombinational forces that give rise to the concerted evolution of the rDNA units. Molecular phylogenetic analysis of elements from 16 Drosophila species suggests these elements have been stable components of the rDNA locus for the 50-70 million year history of the Drosophila genus.
A Dper\R1-element has been sequenced and compared with the R1-elements of a number of other Drosophila species. Phylogenetic analysis suggests that the R1-elements have been vertically transmitted since the inception of the Drosophila genus.