In a plant species, if the b allele (blue flowers) and the b allele (white flowers) are incompletely dominant (bb is light blue), what offspring ratio is expected in a cross between a blue-flowered plant and a white-flowered plant? a. 3/4 blue: 1/4 white b. all light blue c. 1/2 blue: 1/2 white d. 1/4 blue: 1/2 light blue: 1/4 white e. 1/3 blue: 1/3 light blue: 1/3 white