One of the most important unanswered questions facing evolutionists is: “How do those genes act that are responsible for morphogenetic or developmental patterns in multicellular eukaryotes?” The importance of this question lies in the fact that answers to it will provide the most significant links possible between those morphological changes recorded by paleontologists and differences that geneticists can analyze. At present, the gap between the historical documentation of the fossil record and the analysis of evolutionary processes at the level of DNA-coded information is wide and almost completely unbridged, as is clearly shown by the content of the most recent books dealing with development and evolution (Gould, 1977; Raff and Kaufman, 1983).