This book is a collection of views on contemporary trends in modern biology, emphasizing on gametogenesis, fertilization, early and/or delayed embryogenesis in animals, plants and other small organisms. Written by international experts, this book provides an introduction as well as in-depth review on classical as well as contemporary problems that pose a challenge in understanding how living organisms - take birth, grow, and reproduce at levels varying from molecular and cellular levels to individual level. This book covers extensive topics such as somatic embryogenesis in forest plants, microspore embryogenesis, liquid-crystal in embryogenesis and pathogenesis of human diseases, etc.