Concept
Ontogeny
Overview
Ontogeny (also ontogenesis) is the origination and development of an organism (both physical and psychological, e.g., moral development), usually from the time of fertilization of the egg to adult. The term can also be used to refer to the study of the entirety of an organism's lifespan.
Ontogeny is the developmental history of an organism within its own lifetime, as distinct from phylogeny, which refers to the evolutionary history of a species. Another way to think of ontogeny is that it is the process of an organism going through all of the developmental stages over its lifetime. The developmental history includes all the developmental events that occur during the existence of an organism, beginning with the changes in the egg at the time of fertilization and events from the time of birth or hatching and afterward (i.e., growth, remolding of body shape, development of secondary sexual characteristics, etc.). While developmental (i.e., ontogenetic) processes can influence subsequent evolutionary (e.g., phylogenetic) processes (see evolutionary developmental biology and recapitulation theory), individual organisms develop (ontogeny), while species evolve (phylogeny).
Ontogeny, embryology and developmental biology are closely related studies and those terms are sometimes used interchangeably. Aspects of ontogeny are morphogenesis, the development of form and shape of an organism; tissue growth; and cellular differentiation. The term ontogeny has also been used in cell biology to describe the development of various cell types within an organism. Ontogeny is an important field of study in many disciplines, including developmental biology, cell biology, genetics, developmental psychology, developmental cognitive neuroscience, and developmental psychobiology. Ontogeny is used in anthropology as "the process through which each of us embodies the history of our own making".
Overview adapted from Wikipedia (CC BY-SA 4.0; see the article history for authors).
Possible passages
Found by search and not yet checked by a person; they may only mention the idea in passing.
Some of them appear to have no sensation; in others it is very dull. The body of some of them is naturally fleshy, as of those which are called tethya; and the acalephe and the sponge entirely resemble plants; the progress is always gradual by which one appears to have more life and motion than another. 4. In the vital actions also we may observe the same manner. For vegetables which are produced from seed appear to…
Aristotle, Aristotle's History of Animals In Ten Books
States what Ontogeny is; the author is tied to Ontogeny in the knowledge graph.
In its primary stage, every germ consists of a substance that is uniform throughout, both in texture and chemical composition. The first step is the appearance of a difference between two parts of this substance; or, as the phenomenon is called in physiological language, a differentiation. Each of these differentiated divisions presently begins itself to exhibit some contrast of parts; and by and by these secondary…
Herbert Spencer, Essays on education and kindred subjects
States what Ontogeny is.
Substance, in the truest and primary and most definite sense of the word, is that which is neither predicable of a subject nor present in a subject; for instance, the individual man or horse. But in a secondary sense those things are called substances within which, as species, the primary substances are included; also those which, as genera, include the species. For instance, the individual man is included in the…
Aristotle, The Categories
States what Ontogeny is; the author is tied to Ontogeny in the knowledge graph.
Philosophers who discussed Ontogeny
Related ideas
- Morphology (biology)
- Animal
- Genetics
- Julian Huxley
- Ancient Greek
- Embryology
- Organism
- Species
- Ontology
- Physiology
- Stephen Jay Gould
- Anthropology
- Human
- Darwinism
- Developmental biology
- Developmental psychology
- Evolution
- Ernst Haeckel
Place in the tradition
Part of Solipsism.