The book also offers a historical account of the study of animal embryology, a discussion of current cell and molecular-based regulatory mechanisms of developmental processes, comparative embryology
of the chicken and mouse, and a summary of assisted reproductive technologies for production of domestic animals.
Examining seminal and current experiments in such fields as comparative embryology
(repurposing of conserved primitive structures) and developmental genetics (function, conservation, and evolution of the Hox genes), Shubin leads the reader to understand that the evolution of man is supported by a cacophony of different scientific voices.
Contribution to the comparative embryology
of the Liliaceae: Scoliopus, Trillium, Paris and Medeola.