Development of Organisms

Development of Organisms

 

(1) Individual development, or ontogeny, is the aggregate of successive morphological and physiological changes experienced by every organism from the moment of birth to the end of life. Development is a process of closely related quantitative and qualitative rearrangements. Quantitative changes—growth—consist in increase in weight and size of the organism as a whole and of individual body parts or organs. Qualitative changes—differentiation—consist in rearrangement of structure and function of the organism and its parts and organs.

(2) Historical development, or phylogeny, of organisms and their taxonomic groups (phyla, classes, orders, families, genera, species) throughout their existence on earth. The connection between ontogeny and phylogeny is that phylogeny consists in a historical series of ontogenies that have undergone natural selection. (See alsoONTOGENY.)

References in periodicals archive ?
Then 800 million years ago, phosphorus began accumulating in shallow ocean areas near coastlines, apparently setting off chemical chain reactions that pumped oxygen into the atmosphere and oceans, jumpstarting the development of organisms that had more than one cell.
Sheldrake proposed his theory of morphogenetic fields as the only viable alternative to mechanistic and vitalistic theories to explain biological morphogenesis (in general, the issue of biological development of organisms from simple structures, and even the continued development of organisms when a part of the organism is removed).
Texas: This measure, House Bill 285, was aimed at universities and would have forbade any institution of higher education to "discriminate against or penalize in any manner, especially with regard to employment or academic support, a faculty member or student based on the faculty member's or student's conduct of research relating to the theory of intelligent design or other alternate theories of the origination and development of organisms.
The University of Edinburgh team's work, which included his wife Noreen, was hailed as a revolution for scientists in terms of understanding how cells work, how genetics works and how to understand the development of organisms so treatments can be devised when things go wrong.
Synthetic biology's baseline cases are those in which it aims at the development of organisms that are contained and that are thought to be incapable of surviving in the field anyway, both because they have traits that would make them weak competitors in the wild and because they have been designed to self-destruct in the wild.
For high school and college students, scholars, and general readers, this volume describes the applications of DNA technology in forensic science, the development of organisms with genetic characteristics of two different species, genetic testing, gene therapy, molecular farming, and cloning.
Similarly, the structural nature of ontogenetic development of organisms typically leads to the existence of nonadaptive structural elements (spandrels).
This included evidence about the development of organisms that could be used in biological warfare, and the involvement of Iraqi Intelligence services in possible biological warfare activities.
The history of the development of musical groups in Latin American music can be compared to the cell development of organisms.
PENZBERG, Germany -- Cell migration is an important process in the development of organisms, as well as during immune surveillance and wound healing.

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