Genotype – phenotype concept was introduced by
In 1909, Wilhelm Johannsen while working in Denmark proposed the distinction between genotype and phenotype. The distinction was made between the genetic composition of organisms and how they tend to express physical characteristics.
The term "genetics" was first used by Bateson to refer the study of heredity.
Sutton and Boveri were the scientists who propounded the chromosomal theory of inheritance, which identifies chromosomes as the carriers of genetic materials.
Reginald Punnett designed a square diagram to predict the genotypes of a particular cross of breeding experiment.