ontogeny -- n. The growth of an organism through all its developmental stages (embryonic stage through death).
Ontogeny
The history of the development and growth of the individual organism.
Ontogeny
Ontogeny recapitulates phylogeny
List of gene families
Important publications in evolutionary developmental biology ...
ontogeny The course of development of an individual from egg to senescence.
The idea that "ontogeny recapitulates phylogeny" was proposed over a century ago by the biologist Ernst Haeckel. He also made the drawings on which the drawings above are based.
Molecular vestiges
Ontogeny and developmental biology
Mammalian ear bones, reptilian jaws
Pharyngeal pouches, branchial arches
Snake embryos with legs
Embryonic human tail
Marsupial eggshell and caruncle ...
They quote Haeckel as saying "If [recapitulation] was always complete, it would be a very easy task to construct whole phylogeny on the basis of ontogeny. ... There is certainly, even now, a number of lower vertebarte animals (e.g.
These phenomena are expressed by the saying that "ontogeny tends to recapitulate phylogeny." In other words, the ontogeny or development of an organism goes back through its evolutionary past.
[Gk. morphe, form + genesis, origin]
The development of body shape and organization during ontogeny.
morphological
[Gk. morphe, form + logos, discourse]
Pertaining to form and structure, at any level of organization.
developmental stage A term describing a stage in the life cycle of an organism or a point in the ontogeny of an organ.
di-epoxybutane DNA cross linking agent that induces mutations.
Stasigenesis
Phylogenetic stop, stabilization and conservation.
Related Terms:
Phylogenesis
The historic evolution of the phylon, in distinction from ontogeny and from biogenesis.
Embryology may be studied from two aspects: (1) that of ontogeny, which deals only with the development of the individual; and (2) that of phylogeny, which concerns itself with the evolutionary history of the animal kingdom.
At the level of the cell, it is studied in cell biology and at multicellular scales, it is examined in physiology, anatomy, and histology. Developmental biology studies life at the level of the development or ontogeny of an individual organism.
 See also: Evolution, Organ, Phylogeny, Species, Human
  
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