From fertilization through gastrulation an animal embryo experiences an exponential increase in cell number and undergoes dramatic reorganization forming specialized germ layers.  Similarly, between fertilization and seed formation, plants undergo numerous cell divisions and differentiation to form specialized tissue layers.  During this critical period of development embryonic axes are specified and patterns are formed.

Topics Within Early Development

• Early Embryogenesis
• Morphogenic Movements
• Embryonic Patterning