Insertion of two BS elements within the gypsy element present in acHw-1. The two BS elements are in opposite orientations and are 5126bp and 2571bp long respectively. The two BS elements are separated by 337bp gypsy element DNA.
The jockey element present in the progenitor acHw-1 allele is absent.
visible | dominant
macrochaeta & head
macrochaeta & thorax
Slightly weaker phenotype than acHw-1.