Chromosomal theory of inheritance was independently given by Sutton and Boveri in 1902. The two workers found a close similarity between the transmission of hereditary traits and behavior of chromosomes while passing from generation to the next through the agency of gametes. Sutton united the knowledge of chromosomal segregation with Mendelian principles and called it the chromosomal theory of inheritance. Following the synthesis of ideas, experimental verification of the chromosomal theory of inheritance by Thomas Hunt Morgan and his colleagues led to the discovery of the basis for the variations that sexual reproduction produced. Morgan worked with the tiny fruit flies, which were found very suitable for such studies.