Abstract
Genetically marked insecticide-susceptible strains of the German cockroach, Blattella germanica (L.), were crossed to the Seasons-resistant strain to examine the inheritance and linkage of resistance to cypermethrin, fenvalerate, permethrin, and phenothrin. Tests on the F1 progeny from reciprocal crosses indicated that resistance to these pyrethroids is not sex linked and is incompletely recessive in each case. Backcrosses to the Seasons strain resulted in a 1:1:1:1 ratio with the black-body marker from linkage group IV. F2 crosses, involving the orange-body marker from linkage group VI, produced a 9:3:3:1 ratio. These results fit the hypothesis that resistance to each insecticide is inherited as a monofactorial, autosomal, incompletely recessive trait not linked to Bl or or . The data do not allow a distinction between whether 1 gene controls resistance to all 4 insecticides, or whether as many as 4 similarly acting genes are responsible. Other data are discussed that support the latter possibility.
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