Genes operate in the same manner. Individual genes specify individual functions, but the relationship among genes allows physiology. The genome is inert without these relationships. That humans and worms have about the same number of genes—around twenty thousand—and yet the fact that only one of these two organisms is capable of painting the ceiling of the Sistine Chapel suggests that the number of genes is largely unimportant to the physiological complexity of the organism. “It is not what you have,” as a certain Brazilian samba instructor once told me, “it is what you do with it.”
