  This quotation suggests that the relationship between gene and eye-color in classical genetics exhibited the same complexity that Rosenberg discussed at the molecular level (compare this quotation to the passage from Rosenberg 1985 quoted in section 3.2). According to this critique of the unconnectability objection, it is not the case that genotype-phenotype relationships appear simple and uniform at the level of classical genetics and complicated and dis-unified at the molecular level. The situation appears similarly complex at both levels of analysis (Waters 1990).