The 9: 3: 3: 1 phenotype ratio is expected in the f2 generation when question 3 options: the genes for the two traits assort independently the genes for the two traits are located on the x chromosome the genes for two traits are very close together on the same chromosome the alleles for each trait have incomplete dominance

the genes for the two traits assort independently.
The proportion 9:3:3:1 is found when studying two genes at the same time, known as a dihybrid cross. Mendel did this cross and found that the offspring, had 4 different phenotypes, but in different quantities . This ratio led Mendel to develop the law of independent assortment.