iGenetics 3rd Edition by Peter Russell

Exercise 10

In four-o'clock plants, two genes, Y and R, affect flower color. Neither is completely dominant, and the two interact with each other to produce seven different flower colors:
a. In a cross of a crimson-flowered plant with a white one ( y/y r/r ), what will be the appearances of the F 1 plants, the F₂ plants, and the offspring of the F 1 plants backcrossed to their crimson parent?
b. What will be the flower colors in the offspring of a cross of orange-red × pale yellow?
c. What will be the flower colors in the offspring of a cross of a yellow with a y/y R/r white?