GENES, PROTEINS, AND EVOLUTION
". . . we must remember that heredity, development, and evolution are essentially epigenetic and not preformistic. We do not inherit from our ancestors, close or remote, separate characters, functional or vestigial. What we do inherit is, instead, genes which determine the pattern of developmental processes. . . ."
T. DOBZHANSKY, Evolution, Genetics, and Man.
As the genes of a species are modified and reshuffled, occasional organisms will appear within a restricted population having phenotypic characteristics that enable them to explore desirable ecological niches which were unattainable by their predecessors. The individual changes are generally quite small. Many generations must come and go, during which forays into formerly forbidden territory by this developing branch of the population become more fre