When Morgan conduced dihybrid cross on Drosophila like Mendel did with pea plants, the `F_(2)` ratios deviated significantly from than of Mendel's `F_(2)` ratio. Write the explanation Morgan and his group gave to the observations they obtained from their experimant.

Explanation

Morgan and his group kenw that the genes were located on the x-chromosome and saw quickly that when the two genes in a dihybrid cross were situated on the same chromosome, the proportion of parental gene combination were much higher than the non-parental type. Morgan attributed this due to the physical association or linkage of the two genes and coined the term 'linkage' to describe the physical association of genes on a chromosome and the term 'recombination' to describe the generation of non-parental gene combination. Morgan and his group also found that even when genes were grouped on the same chromosome, some genes were tightly linked while others were loosely linked