evolution

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evolution

 [ev″o-lu´shun]
the process of development in which an organ or organism becomes more and more complex by the differentiation of its parts; a continuous and progressive change according to certain laws and by means of resident forces.
convergent evolution the development, in animals that are only distantly related, of similar structures or functions in adaptation to similar environments.

ev·o·lu·tion

(ev'ō-lū'shŭn),
1. A continuing process of change from one state, condition, or form to another.
2. A progressive distancing between the genotype and the phenotype in a line of descent.
3. The liberation of a gas or heat in the course of a chemical or enzymatic reaction.
[L. e-volvo, pp. -volutus, to roll out]

evolution

/evo·lu·tion/ (ev″ah-loo´shun) a developmental process in which an organ or organism becomes more and more complex by differentiation of its parts; a continuous and progressive change according to certain laws and by means of resident forces.
convergent evolution  the appearance of similar forms and/or functions in two or more lines not sufficiently related phylogenetically to account for the similarity.
organic evolution  the origin and development of species; the theory that existing organisms are the result of descent with modification from those of past times.

evolution

(ĕv′ə-lo͞o′shən, ē′və-)
n.
1. A continuing process of change from one state, condition, or form to another.
2. Change in the genetic composition of a population during successive generations, often resulting in the development of new species. The mechanisms of evolution include natural selection acting on the genetic variation among individuals, mutation, migration, and genetic drift.

evolution

[ev′əlo̅o̅′shən]
Etymology: L, evolvere, to roll forth
1 a gradual, orderly, and continuous process of change and development from one condition or state to another. It encompasses all aspects of life, including physical, psychological, sociological, cultural, and intellectual development, and involves a progressive advancement from a simple to a more complex form or state through the processes of modification, differentiation, and growth.
2 a change in the genetic composition of a population of organisms over time.
3 the appearance over long periods of time of new taxonomic groups of organisms from preexisting groups. Kinds of evolution are convergent evolution, determinant evolution, emergent evolution, organic evolution, orthogenic evolution, and saltatory evolution. evolutionist, n.

ev·o·lu·tion

(ev'ŏ-lū'shŭn)
1. A continuing process of change from one state, condition, or form to another.
2. A progressive distancing between the genotype and the phenotype in a line of descent.
[L. e-volvo, pp. -volutus, to roll out]

evolution

The theory that all living organisms have developed in complexity, from a simple life form. Evolution occurs by the natural selection of those who, by the fortune of spontaneous random changes (mutations), happen to be best suited to their contemporary environment, to survive and reproduce. It does not occur by the passing on to offspring of characteristics acquired during the lifetime of an individual. Characteristics are passed on by the transmission of DNA from parents to offspring and, unless mutation has occurred, this DNA is an identical copy of the DNA of preceding generations.

evolution

an explanation of the way in which present-day organisms have been produced, involving changes taking place in the genetic make-up of populations that have been passed on to successive generations. According to DARWINISM, evolutionary MUTATIONS have given rise to changes that have, through NATURAL SELECTION, either survived in better adapted organisms (see ADAPTATION, GENETIC), or died out. Evolution is now generally accepted as the means which gives rise to new species (as opposed to SPECIAL CREATION) but there is still debate about exactly how it has taken place and how rapidly changes can take place. See LAMARCKISM.

evolution

the process of development in which an organ or organism becomes more and more complex by the differentiation of its parts; a continuous and progressive change according to certain laws and by means of resident forces.

convergent evolution
the development, in animals that are only distantly related, of similar structures or functions in adaptation to similar environment.
divergent evolution
the development of different characteristics in animals that were closely related in response to being placed in different environments.

Patient discussion about evolution

Q. How the bacterias are produced?

A. The Bacteria are a large group of unicellular microorganisms. Typically a few micrometres in length, bacteria have a wide range of shapes, ranging from spheres to rods and spirals. (The name comes from the Greek bakterion, meaning small staff.) Bacteria are ubiquitous in every habitat on Earth, growing in soil, acidic hot springs, radioactive waste,[2] water, and deep in the Earth's crust, as well as in organic matter and the live bodies of plants and animals. There are typically 40 million bacterial cells in a gram of soil and a million bacterial cells in a millilitre of fresh water; in all, there are approximately five nonillion (5×1030) bacteria on Earth,[3] forming much of the world's biomass.[4] Bacteria are vital in recycling nutrients, with many important steps in nutrient cycles depending on these organisms, such as the fixation of nitrogen from the atmosphere and putrefaction. http://en.wikipedia.org/wiki/Bacteria Hope this helps.

More discussions about evolution
References in periodicals archive ?
Le role des cours provinciales--et celui des tribunaux en general--est donc percu de maniere evolutive et non statique.
Pearce-Duvet, Centre d'Ecologie Fonctionnelle et Evolutive, Centre National de la Recherche Scientifique-Unite de Mixte de Recherche 5175, 1919 Route de Mende, F-34293 Montpellier, France; email: jessica.
In our working group at Universidad de la Republica, we designed evolutive algorithms for solving the generalized problem trying to keep the codification and variation operators as simple as possible [2,12,13].
Clients can give their specific requirements to the team, who then feed the information into the Evolutive Property Database and are matched up with suitable and available properties.
L'approche evolutive, dans une logique ascendante, pratiquee des l'amorce des discussions sur le reamenagement du Vieux-Port par le gouvernement federal, et mise en oeuvre par la Societe du Vieux-Port a montre son interet dans le long terme.
Sa recension impressionnante d'etudes tant litteraires qu'historiques, dont il offre des syntheses remarquables (chapitres 3 et 4), insere clairement son histoire evolutive et litteraire du pamphlet dans le contexte de l'explosion de l'imprime durant la periode et ce, dans le contexte europeen autant que britannique.
Metamorphosis -an evolutive jump within the survival pathways traced by determined animal species- may also be an example to show sharp structural changes, which involve recurrent organizative and reorganizative developmental processes in response to injury.
Another of Chambers's concepts that reappears in Emerson's later work is the proposition that evolutive development is directly affected by the environment.
Journal of Computer Science and Technology Special Issue: Artificial Intelligence and Evolutive Computation.
Azzedine Bounite a insiste pour remettre le debat dans un cadre conceptuel aussi serein que productif, y a-t-il eu jamais depassement du cycle textuel dans la suite reelle de la creation dramatique marocaine, n'est-il pas immodere de conclure a un post-drame avant d'envisager le terme dans sa plenitude evolutive, ne doit-on pas relativiser la disjonction entre dehors et dedans quand on aborde un texte theatral qui n'acheve pas sa phase d'instauration.
Concernant l'application du regime des sanctions, il a soutenu que son comite avait demande a l'equipe de surveillance de lui fournir, sur une base annuelle, des [beaucoup moins que]informations confidentielles[beaucoup plus grand que] sur une mise a jour de cette liste afin qu'elle reflete fidelement la nature evolutive de la menace terroriste posee par Al-Qaida.