A gel bait-resistant Blattella germanica (L.) strain (Cincy) was collected in Cincinnati, OH, in 2003. This strain exhibited strong behavioral resistance to Avert (0.05% abamectin), Maxforce FC (0.01% fipronil), and Pre-Empt (2.15% imidacloprid) gel baits. Reciprocal mass crosses and back crosses between the Cincy strain and a susceptible strain (Jwax) were made and tested for their inheritance of resistance to Avert, Maxforce FC, and Pre-Empt gel baits. Topical assays comparing the parental and reciprocal-heterozygous strains indicated the resistance to fipronil was incompletely recessive. LD₅₀ and LD₉₀ values of the Jwax♂ × Cincy♀ strain were not significantly different from the Jwax♀ × Cincy♂ strain, suggesting no sex linkage in physiological fipronil resistance. Feeding assays revealed that F₁ reciprocal crosses were significantly less responsive to blank Avert and Maxforce FC baits (without active ingredients) than the susceptible strain. The Jwax♀ × Cincy♂ strain did not display significantly greater consumption of blank Avert and Maxforce FC baits relative to the Jwax♂ × Cincy♀ strain. In feeding assays with agar containing d-fructose, d-galactose, d-glucose, d-lactose, d-maltose, and d-sucrose, the crosses showed an intermediate feeding response to glucose compared with the Cincy and Jwax strains, and a similar response to other sugars compared with the Jwax strain. The Jwax♂ × Cincy♀ strain was significantly less responsive to glucose than the Jwax♀ × Cincy♂ strain. Mortality induced by Avert, Maxforce FC, and Pre-Empt gel baits against the F₆ Jwax♂ × Cincy♀ strain was 44.2 ± 6.8, 92.9 ± 2.1, and 78.7 ± 5.2%, respectively, indicating the resistance to Avert and Pre-Empt gel baits inherited by Cincy females was extremely stable. The F₆ Jwax♂ × Cincy♀ strain was significantly more resistant to Avert, Maxforce FC, and Pre-Empt than the F₆ Jwax♀ × Cincy♂ strain. These findings suggest that behavioral resistance to gel baits has weak sex-linkage, with a greater degree of the resistance trait being inherited by female cockroaches. Alternatively, physiological resistance to fipronil has no sex-linkage, but it is nonetheless important to the complete resistance phenotype.