The term "linkage" was coined by
The term linkage was coined by T.H. Morgan
Morgan carried out several dihybrid crosses in Drosophila to study genes that were sex-linked. Morgan attributed this due to the physical association or linkage of the two genes and coined the term linkage to describe this physical association of genes on a chromosome.
Chromosomal theory of inheritance given by W. Sutton and T. Boveri
G. Mendel is known as the father of Genetics.