In Eukaryotic organisms morphogenesis is linked to peculiar properties of plasmalemma and cytoskeleton. In the Protozoa these properties allow the formation of structures of colonial type derived either from the descent of a single cell or from the confluence of isolated cells. In Plants morphogenesis is linked to the orienting of spindles and divisory plans during mitoses, while in the Metazoa cells reach their position in the embryonic frame by active morphogenetic movements: their number and relative position are controlled by regulating mechanisms.