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. Author manuscript; available in PMC: 2014 Jul 8.
Published in final edited form as: Science. 2013 Nov 15;342(6160):846–850. doi: 10.1126/science.1239552

Fig. 1. Evolutionary history of Drosophila miranda sex chromosomes.

Fig. 1

The ancestral X chromosome shared by all members of the Drosophila genus (in red) fused to an autosome roughly 15 MY ago, creating chromosome XR (in orange). Another autosome fused to the Y chromosome about 1 MY ago, creating the neo-X chromosome (in yellow). D. miranda thus harbors three X chromosomes of different ages. Species abbreviations are as follows: D. subobscura (Dsub), D. pseudoobscura (Dpse), and D. miranda (Dmir).