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The initial stages of human embryogenesis Parts of a human embryo. Ontogeny (also ontogenesis) is the origination and development of an organism (both physical and psychological, e.g., moral development [1]), usually from the time of fertilization of the egg to adult.
The theory of recapitulation, also called the biogenetic law or embryological parallelism—often expressed using Ernst Haeckel's phrase "ontogeny recapitulates phylogeny"—is a historical hypothesis that the development of the embryo of an animal, from fertilization to gestation or hatching (), goes through stages resembling or representing successive adult stages in the evolution of the ...
Ontogenetic niche shift (abbreviated ONS) [1] is an ecological phenomenon where an organism (usually an animal) changes its diet or habitat during its ontogeny (development). [2] During the ontogenetic niche shifting an ecological niche of an individual changes its breadth and position. [ 3 ]
EDP is closely linked to the theoretical framework of evolutionary psychology (EP), but is also distinct from EP in several domains, including: research emphasis (EDP focuses on adaptations of ontogeny, as opposed to adaptations of adulthood); consideration of proximate ontogenetic; environmental factors (i.e., how development happens) in ...
The zoologist A. J. Cain, in Nature, called it "a superb analysis of the use of ontogenetic analogy, the controversies over ontogeny and phylogeny, and the classification of the different processes observable in comparing different ontogenies."
On the other hand, the common definition of adaptation is a central concept in evolution: a trait that was functional to the reproductive success of the organism and that is thus now present due to being selected for; that is, function and evolution are inseparable.
Hierarchical analysis of ontogenetic time describing heterochrony and taxonomy of developmental stages is viewed as a segmentation of ontogenetic time depicting phylogenesis. [3] This permits the graphical depiction of time based evolutions of organs for a set of species, and is consistent with accepted theories of evolutionary biology .
Developmental drive is the inherent natural tendency of organisms and their ontogenetic trajectories to change in a particular direction (i.e. a bias towards a certain ontogenetic trajectory). [14] [5] [6] This type of bias is thought to facilitate adaptive evolution by aligning phenotypic variability with the direction of selection. [15] [12]