Phylogenetic relationships among syntenic chromosomes of the analysed <i>Drosophila</i> species.

<p>The scheme shows the phylogenetic relationships between <i>D</i>. <i>melanogaster</i>, <i>D</i>. <i>pseudoobscura</i>, its sibling species <i>D</i>. <i>persimilis</i> and <i>D</i>. <i>virilis</i>, as defined by Muller [<a href="http://www.plosgenetics.org/article/info:doi/10.1371/journal.pgen.1006212#pgen.1006212.ref045" target="_blank">45</a>]. The syntenic Muller elements (right) are shown by the number of their corresponding chromosomes.