Figure 1From: Hybrid male sterility between Drosophila willistoni species is caused by male failure to transfer sperm during copulationBoxplot showing results from copulation duration assays. Q = D. w. quechua females mated to conspecific males; W = D. w. willistoni females mated to conspecific males; F1QW and F1WQ = Sterile and fertile hybrid males respectively, mated to both Q and W females. N = Number of flies tested.Back to article page