Developmental Biology, twelfth edition, engages students and empowers instructors to effectively teach both the stable principles and the newest front-page research of this vast, complex, and multi-disciplinary field. This much loved, well-illustrated, and remarkably well written textbook invigorates the classical insights of embryology with cutting edge material, and makes the most complex topics understandable to a new generation of students. Designed with the undergraduate student in mind, this new, streamlined edition now contains studies of plant development, expanded coverage of regeneration, over a hundred new and revised illustrations, and deeply integrated active learning resources that build on the text's enthusiasm and accuracy. This is a text designed to make students become excited about how animals and plants develop their complex bodies from simple origins.NEW TO THIS EDITIONA focused and streamlined presentation of essential content highlights the important principles of each sectionNew Further Development feature makes for easy distinction between foundational and advanced coverage in each chapter both in the text and onlineNew content on plant development is now included throughout the book to help students appreciate common developmental principles across organismsA new introductory chapter encompasses the big picture and introduces common themes that students will encounter throughout the bookAn upgraded and comprehensive chapter on regeneration reflects the excitement of new discoveries in this expanding area of developmental biologyThoroughly updated chapters include important new studies on single cell transcriptomes, stem cell niches, cell communication during morphogenesis, fertilization, CRISPR technology, and the effects of global climateAn upgraded illustration program includes more than 125 new and revised figures