In this lab we examine some patterns of embryology in animals. Development from a single cell to an adult organism entails growth, differentiation and morphogenesis. Differentiation is the specialization of a cell line.
Morphogenesis is the formation of the physical structure of the organism.
This is also irreversible. In this lab we will look at some early stages of development in three deuterostomes, sea urchin, frog and chicken. See cladograms for pattern of relationship. Eggs differ in the amount and location of yolk. Yolk contains stored nutrients the organism will use in development.