Figure 3.—

Estimated viabilities of TM2/+ and TM1/+, relative to TM1/TM2, for those cases where TM2 invaded successfully. These estimates are made assuming constant fitnesses (Table S1). Pairs of replicates are linked by lines. Top left, the 15 chromosomes for which +/+ was lethal. Top right, the 4 chromosomes for which +/+ was viable. (Note the very low viability of TM1/+ in one pair of replicates.) Bottom left, the 11 chromosomes from Fowler et al. (1997) in which TM2 invaded. (Line 52, in which TM2 did not fix, is not shown, because viability estimates there are confounded.) Bottom right, comparison among all three classes. Only the geometric means of replicate estimates are shown. Solid circles, +/+ lethal; dark-shaded circles, from Fowler et al. (1997); light-shaded circles, +/+ viable.