Ontogeny

Under the ontogeny or ontogeny (from Greek ὀντογένεση; composite of ὄν on, " beings " and γένεσις génesis, "birth ", " origin " ) is generally understood as the history of structural change of one unit without loss of their organization.

In a narrow sense:

• In biology and medicine, the development of the individual organism from the fertilized egg to adult living beings ( according to Ernst Haeckel, 1866 ).
• In developmental psychology and psychoanalysis the individual (psychological ) development (more precisely: psychogenesis ).

In biology, the antonym phylogeny; this is the story of the tribe of all living things and its branches ( applied but also on sections of the overall system - kinship groups - down to the individual biological species ).

Somatogenesis

In the embryo develop gradually organ systems, from which organs are formed in which again the cells ( grouped into tissues ) to specialize further.

Biogenesis

The biological ontogeny of a multicellular organism can be divided into the phases of conception → → blastogenesis embryogenesis Fetogenese → → → birth infant toddler phase phase → ​​→ → juvenile stage pubescence adolescence → → → climacteric senescence divide → death.

• In plants, after Hans Mohr: Embryonic phase → ​​Vegetative phase generative phase → ​​→ senescence
• For cereals by Gerhard Geisler: germination seedling growth → → → tillering elongation growth of stems → growth of inflorescence inflorescence forth → → → Anthesis occurs milk stage of maturity Dough → → → maturity stage resting phase