Solution:

Hunt, Thomas Morgan and his colleagues carried out multiple dihybrid crosses of drosophila to examine the sex-linked genes and experimentally proved the theory of inheritance. Example: Morgan intercrossed the F1 progeny of yellow-bodied, white-eyed females with brown-bodied, red-eyed males. He discovered that the two genes did not segregate independently of one another, and that the F2 ratio was significantly different from the 9:3:3:1 ratio. The two genes were discovered to be on the same chromosome by Morgan and his colleagues. Morgan came to this conclusion because to the physical relationship of two genes, also known as linkage. Even though they are in the same chromosome some are tightly and some are loosely linked showed only 1.3% recombination while white and miniature wing showed 37.2% recombination.