Fig. 1.

Genetics of flower color. Flowers of A.m.striatum (A, ros^s/ros^s EL^s/EL^s sulf^s/sulf^s) and A.m.pseudomajus (B, ROS^p/ROS^p el^p/el^p SULF^p/SULF^p). Each panel shows face view (Left), inside of dorsal petals (Right), and closeup (Bottom). Arrowheads highlight dorsal (A) and ventral (B) patterns. (C–G) Progeny of crosses between plants from the hybrid zone and lines of A. majus, illustrating phenotype of various allele combinations. All are SULF^m/- or SULF^p/-. (C) ros^s/ros^d el^p/el^m ve/ve gives a flower with pale magenta color on petal periphery. (D) ros^s/ros^s el^p/el^p VE/- has flowers with magenta veins because of VE. (E) ROS^p/ROS^p el^p/el^p gives strong magenta throughout the flower due to ROS allele (venosa genotype unknown). (F) ros^s/ros^s EL^s/EL^s VE/- has vein pigment restricted to a central region. (G) ROS^p/ROS^p EL^s/EL^s ve/ve giving a restricted pattern of pigmentation compared with E. (H) ROS*/ROS* el^p/el^p ve/ve have spread magenta but of weaker intensity than conferred by ROS (compare with E). Allele superscripts and abbreviations used in figure legend: *, recombinant; d, dorsea (mutant in A. majus background); m, majus; p, A.m.pseudomajus; s, A.m.striatum; X/-, unknown whether homozygous or heterozygous for dominant allele X.