 A paradigmatic example of the first line came from Lenny Moss’s distinction between Gene-P and Gene-D (Moss 2001, 2002). Gene-P embraced an instrumental preformationism (providing the “P”); it was defined by its relationship to a phenotype. In contrast, Gene-D referred to a developmental resource (providing the “D”); it was defined by its molecular sequence. An example will help to distinguish the two: When one talked about the gene for cystic fibrosis, the most common genetic disease affecting populations of Western European descent, the Gene-P concept was being utilized; the concept referred to the ability to track the transmission of this gene from generation to generation as an instrumental predictor of cystic fibrosis, without being contingent on knowing the causal pathway between the particular sequence of DNA and the ultimate phenotypic disease. The Gene-D concept, in contrast, referred instead to just one developmental resource (i.e., the molecular sequence) involved in the complex development of the disease, which interacted with a host of other such resources (proteins, RNA, a variety of enzymes, etc.); Gene-D was indeterminate with regards to the ultimate phenotypic disease. Moreover, in cases of other diseases where there are different disease alleles at the same locus, a Gene-D perspective would treat these alleles as individual genes, while a Gene-P perspective treats them collectively as “the gene for” the disease. (For other examples of gene-concept dividers, see Keller’s distinction between the gene as a structural entity and the gene as a functional entity as well as Baetu’s distinction between the gene as a syntax-based concept and the gene as a mapping concept (Baetu 2011; Keller 2000).)