What did they discover of Wilhelm johannsen?

Wilhelm Johannsen was a Danish botanist and geneticist known for coining the terms "gene," "genotype," and "phenotype." He emphasized the distinction between the genetic makeup of an organism (genotype) and its observable traits (phenotype). Johannsen's work laid the foundation for modern genetics, particularly in understanding how traits are inherited and expressed in living organisms. His research contributed significantly to the field of heredity and the development of evolutionary theory.