As to genotypic and phenotypic : For example, the essence of a given crystal, that is, its essence in the strict sense and residing in the genotypic domain of the crystal, is the relevant crystallization law. The resulting crystal then intrinsically has, and can be fully characterized by, its Space Group symmetry and its Chemical Composition. These latter features can be observed (in X-ray diffraction technique, respectively chemical analysis) and belong therefore in the crystal's phenotypical domain. Together these two features constitute the phenotypic expression of the crystal's essence. The Space Group symmetry is a part of this phenotypic expression, while the Chemical Composition is another part of it. Both are generic properties of the given crystal, while together they constitute a specific property of that given crystal.
The genotypical essence, the crystallization law, also has parts which can be denoted as genus and differentia.