 In the molecular realm, yet another gene concept, gene-D, can be identified, which is characterized in contrast to the gene-P and captures a situation in which researchers identify genes as developmental resources (Moss 2003: Ch. 1). Genes-D are typically classical molecular genes, but here the emphasis is on function rather than structure and especially on function beyond the initial role as template. As pointed out by Weber (2005: Ch. 7), researchers’ attention is often initially guided towards a part of DNA sequence conceptualized as gene-P, that is, as associated with phenotypic variation. Once the relevant gene is cloned and the regulatory networks in which it is involved as well as the activities of its product are investigated, it frequently becomes clear that it is expressed in many tissues, in different contexts and at different times (see  §1.4).  Furthermore, the locus in question often functions as template for a large variety of products. Hence, while the gene-P is indeterminate with respect to sequence, the gene-D is indeterminate with respect to phenotype. Addressing a gene as gene-D means to investigate its various roles in the process of epigenesis. The fact that the absence of one or several of these products leads to phenotypic change does not imply that the resource is more important in the development of the structure exhibiting the phenotype than the large number of other genes involved and their respective products. Instead, the phenotype shows how the developmental process responds to the absence of a resource. The fallacious notion of genes for a certain trait (e.g., blue eyes) containing developmental information (e.g., for making blue eyes) results when biologists (or commentators) conflate the separate notions that genes-D contain template information and that genes-P contain predictive information (Moss 2003: Ch. 1 and 2). While “gene for” talk is misleading in the context of development (Kampourakis 2017), the notion has been defended in the context of evolution (Kaplan &amp; Pigliucci 2001).