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Schematic of the speciation history of D. arizonae and D. mojavensis. The onset of divergence around 1.3 MY was followed by a prolonged period of gene flow that ceased before the divergence of the different populations of D. mojavensis. Inversion 2q arose in D. mojavensis during the onset of divergence (blue star) and is the first in a cascade of three overlapping inversions on chromosome 2 that became fixed in D. mojavensis (adapted from Guillen and Ruiz (2012)).
