Fig. 1
From: The genetic basis of female pheromone differences between Drosophila melanogaster and D. simulans
Creation of female offspring used for deficiency mapping to locate genes contributing to cuticular hydrocarbon production. The gray bars represent homologous D. melanogaster 3rd chromosomes; the vertical white bars represent D. simulans homologous 3rd chromosomes. Females from the deficiency strains, which are entirely D. melanogaster, are either (a) crossed interspecifically to D. simulans males (resulting in F1 hybrid offspring) or (b) crossed intraspecifically to D. melanogaster males. Each deficiency strain harbors a dominant visible marker (DVM) on the balancer (Bal) chromosome, and a deleted region (represented by a gap in the chromosome) on the deficiency (Df) chromosome. Intraspecific and interspecific crosses with these deficiency lines produce four F1 genotypes: sim/Bal, sim/Df, mel/Bal, and mel/Df
