Genetik des Äußeren

Valentin Haecker was one of the forerunners of experimental biology, genetics, and developmental physiology. In his ?Entwicklungsgeschichtliche Eigenschaftsanalyse” (Evolutionary Analysis of Traits) published in 1918, Haecker tried to determine the earliest stages in the development of the phenotype (Phenogenetics). His major objective was to integrate two of the most important concepts of Mendelian genetics, phenotype and genotype, within a well‐articulated theory. Haecker realized that a proper analysis of how the genotype gives rise to the phenotype requires an integration of knowledge from the fields of morphology, physiology and experimental embryology.