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Abstract
IN an earlier study1 on the inheritance of dieldrin resistance in Lucilia cuprina, involving a cross between susceptible females and a single resistant male, F2 and back-cross ratios, obtained by employing the discriminating dose technique2,3, indicated that dieldrin resistance in this insect can be explained in terms of a single gene. Information is now presented from reciprocal crosses between resistant and susceptible strains. The discriminating dose method was again utilized, with the results shown in Tables 1 and 2. The data from the F2 and back-cross ratios suggest a simple Mendelian interpretation, even though the F1 and F2 data conform to a polygenic pattern, namely, intermediate resistance in F1 progeny with both parental types in the F2.
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