 In the continuing debate over developmental versus traditional theories of evolutionary biology, Sterelny et al. (1996) hold a fairly conservative position. They agree with the developmentalists that genes play no privileged role in the development of phenotypes from genotypes. Genes do play a role in this process, simply not a privileged role. Genes can serve as a causal bridge from phenotype to phenotype, but other entities can do so as well. Genes are not the only replicators in biological evolution. The repeated cycles in inheritance include many different sorts of constancies and repetitions—genes, cellular machinery, phenotypic traits including behaviors, and social structures. Information remains central to selection processes, but genes are not the only carriers of such information. Genes predict phenotypic characters only in the same sense that environmental factors predict them. Sterelny (2000a) has argued that developmental considerations require no fundamental reevaluation of evolutionary conceptions along the lines of DST.