
Distribution of gene movements in the Drosophila phylogenetic tree. Relocations based on RNA and DNA are located above and below the branch lines, respectively. Movements between chromosomes are presented as follows: (△) X→A; (○) A→X (⋄) A→A. The average expected proportions of these relocations are 21:23:56, respectively. For species bearing neo-X chromosome the average expected proportions are 35:34:31.











