Two plants with white flowers, each from true-breeding strains,were crossed. All the F1 plants had red flowers. Whenthese F1 plants were intercrossed, they produced anF2 consisting of 92 plants with red flowers and 69 withwhite flowers.

a. Propose an explanationfor the inheritance of flower color in this species, assuming thatcolor is determined by two independently assorting genes.

b. Propose a biochemical pathway for flower pigmentation and indicate which genes control which steps inthis pathway.