During his experiments with Drosophila, Morgan discovered that

Options

A. the genes for linkage were located on the Y-chromosome
B. If two genes in a dihybrid cross were situated on the same chromosome, the proportion of non-parental gene combination were much higher than the parental type
C. The distance between genes couldn't be measured using the frequency of recombination between gene pairs on the same chromosome.
D. When genes were grouped on the same chromosome, very tightly linked genes showed very low recombination while loosely linked genes showed higher recombination

Answer

D