The 16 amino acid insertion that is present in frequencies near fixation in the Dsim\Lhr coding region is missing in this mutation. In addition, there is a complex mutation in a conserved sequence near the C terminus of the coding sequence, which includes a 12bp in-frame deletion and nonsynonymous mutations causing unique substitutions in 6 adjacent amino acids.
Hybrid male progeny of a cross of D. melanogaster females to D. simulans Dsim\Lhr1 males have a viability of approximately 49% relative to their hybrid female siblings.