Incluye referencias bibliográficas e índice. CONTENIDO: Questions introducing developmental biology. Comprehending development: Generating new cells and organs -- Differential gene expression in development -- Cell-cell communication in development -- Specification introducing cell commitment and early embryonic development. Fertilization: Beginning a new organism -- Early development: Rapid specification in snails and nematodes -- The genetics of axis specification in Drosophila -- Sea urchins and tunicates: Deuterostome invertebrates -- Early development in vertebrates: Amphibians and fish -- Early development in vertebrates: Birds and mammals -- The stem cell concept Introducing organogénesis. The emergence of the ectoderm: Central nervous system and epidermis -- Neural crest cells and axonal specificity -- Paraxial and intermediate mesoderm -- Lateral plate mesoderm and the endoderm -- Development of the tetrapod limb -- Sex determination -- Postembryonic development: Metamorphosis, regeneration, and aging -- The saga of the germ line -- Systems biology expanding developmental biology to medicine, ecology, and evolution. Birth defects, endocrine disruptors, and cáncer -- Ecological developmental biology: Biotic, abiotic, and symbiotic regulation of development -- Developmental mechanisms of evolutionary change.