 The implication was that many other genes were also elaborately regulated.In 1977, a revolution in thinking about evolution and developmental biology began, with the arrival of recombinant DNA technology in genetics, and the works "Ontogeny and Phylogeny" by Stephen J. Gould and "Evolution by Tinkering" by François Jacob.Gould laid to rest Haeckel's interpretation of evolutionary embryology, while Jacob set out an alternative theory.