Fenitrothion resistance in Anopheles atroparvus (Van Theil) from Spain appears to be dependent on a single major, autosomal, semidominant gene. Propoxur resistance in the same population is dependent on more than one gene. Since there is cross-resistance between these two chemicals in this strain of A. atroparvus, then either one of the propoxur resistance genes also confers resistance to fenitrothion, or else fenitrothion resistance and one of the propoxur resistance genes are closely linked. The mutant marker stripe and fenitrothion resistance assort independently.
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Janet Hemingway (1982) studied this question.
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