In a species of wildflower, flower colour is determined by two unlinked genes, A A\,A and BBB, which control a biochemical pathway as shown in the diagram below:
A homozygous white-flowered plant with genotype aaBB aaBB\,aaBB is crossed with a homozygous pink-flowered plant with genotype AAbbAAbbAAbb. All of the F1 F_1\,F1 offspring are blue-flowered. Two F1 F_1\,F1 plants are crossed with each other to produce the F2 F_2\,F2 generation.
If 640 offspring are produced in the F2 F_2\,F2 generation, what is the expected number of white-flowered plants?
120
160
360
480
