A cross is made between two true-breeding strains of zucchini. One has green fruit and the other has yellow fruit. The F1 plants are all green. When the F1 plants are crossed, the F2 plants occur in a ratio of 9 green: 7 yellow, indicating that the progeny resulted from a dihybrid cross. Of the green plants, what is the probability of being homozygous dominant at both loci? 1/16 1/9 3/4 2/3 1/4 The answer is 1/9 but I don’t understand why. Can someone please explain how you can figure out the genotype from this and why it’s 1/9?
