Well i hope you understand what a ratio. First we take a look at how most of the color is black so thats our biggest next we look t what color is least which is orange now count the orange and the yellow and separate them!! Theres your answer :)
We get the dominant phenotype in plants that have at least one dominant allele of EACH of the two genes; otherwise we get the recessive phenotype. So, the observed ratio in the F2 generation is 9:7.
