In figure 6-16, no blue flowers would require the dominant allele.
On crossing W+/-; m/m X w+/- m/m,
The offspring obtained would be 3:1 pink to white. This condition occurs if the parents used in the mating were heterozygous (w+/w; m/m). But, at the same time, all the plants would be pink if the mated parents were homozygous (w+/w+; m/m).