Figure 2.

Parent–progeny backcrossing scheme to test S allele dominance interactions in the B4 × O19 backcrossed to O19 progeny lines. The S genotypes and S phenotype labels follow the same scheme as Figure 1. The S genotypes below the pistil and stamen images have been omitted where crossing results did not permit conclusive identification. (a) A progeny where the first parent was O19 with an S₆S_rec genotype and the second parent was a B4 × O19 progeny individual, (B4 × O19)-8, that was compatible with both parents. (b) A progeny where the first parent was O19 and the second parent was (B4 × O19)-5 that was compatible with the O19 parent but not the B4 parent.