Module 8: Figure summary of development
Summary of the major processes occurring during development.
The sequence of developmental events is triggered at fertilization. Initially, the cells proliferate rapidly, and, as the embryo grows, a process of specification begins to apportion cells to specific cell fates. An important feature of specification is the establishment of the different axes beginning with the dorsal–ventral (D-V) axis and culminating with planar cell polarity (PCP). During specification, cells are apportioned into compartments to continue their development. The final form of the animal is revealed through a process of differentiation. A process of de-differentiation can reverse some of the events of differentiation as occurs during regeneration and cardiac hypertrophy.