FIG. 2.

Relative adult eclosion percentages for male and female progeny resulting from reciprocal crosses of the Oregon R 1970 and PVM strains. Embryos were seeded on arsenite-free or arsenite-containing food and the sex of eclosing adults scored as a percentage of the total flies hatching at that concentration. Strains are designated as resistant (R) or sensitive (S) based on the data in Figure 1; the crossing scheme shown below represents the expected genotype of progeny from the reciprocal crosses if the arsenite tolerance/sensitivity gene(s) were X-linked.