Give the experimental verification of the chromosomal theory of inheritance.

Explanation

Sutton and Boveri argued that the pairing and separation of a pair of chromosomes would lead to the segregation of a pair of factors they carried.
= Sutton united the knowledge of chromosomal segregation with Mendelian principles and called it the chromosomal theory of inheritance.
= Experimental verification of the chromosomal theory of inheritance by Thomas Hunt Morgan and his colleagues, led to discovering the basis for variation that sexual reproduction produced.
= Morgan worked with the tiny fruit flies Drosophila melanogaster which were found very suitable for such studies.
= They could be grown on simple synthetic medium in the laboratory.
= They complete their life cycle in about two weeks and a single mating could produce a large number of progeny flies.
= There was a clear differentiation of the sexes i.e. male (smaller) and female (bigger).
= It has four pairs of chromosomes which differ in size.
= It has many types of hereditary variations that can be seen with low power microscope.