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Theory in Biological Definition

Abiogenesis

... abiogenesis 2.1 Scientific critics of the theory 2.2 Religious criticism of the theory 3 References 4 External links ... autogenesis, and archebiosis ), was the theory according to which fully formed living organisms ...

Alfred Russel Wallace

... biologist . Wallace's independent proposal of a theory of evolution by natural selection prompted ... more developed and researched, but unpublished, theory sooner than he had intended. Contents ... Exploration and study of the natural world 3 theory of evolution 4 Religious views, and ...

Artificial life

... a lecture titled "The General and Logical theory of Automata." He defined an "automata" as any ... Turing . Von Neumann worked on his automata theory intensively right up to his death, and ... neural nets Lindenmayer systems game theory Open problems "What is life?" "When ...

Biology

... Charles Darwin established evolution as a viable theory by articulating its driving force: natural ... biologists as definitive evidence in favor of the theory of universal common descent ( UCD ) for all ... and the understanding of behavior in terms of the theory of natural selection . In one sense the first ...

Brain

... the brain using the mathematical tools of chaos theory and dynamical systems . Interfacing brains ... led scientists away from the fluid mechanical theory of the brain and toward an electrical theory. ... Pierre Flourens championed the aggregate field theory in opposition to the pseudoscience of ...

Charles Darwin

... an English naturalist whose revolutionary theory laid the foundation for both the modern theory of evolution and the principle of common ... 3.1 Transmutation 3.2 Proposal 3.3 My theory 4 Marriage and children 5 Family, ...

Chromatography

... 1 History 2 Chromatography theory 2.1 Retention 2.2 Plate theory 3 Paper chromatography 4 Thin layer ... molecules to be resolved. Chromatography theory Chromatography is a separation method that ...

Common descent

... they have a common ancestor . In biology , the theory of universal common descent proposes that all ... a common ancestor or ancestral gene pool. A theory of universal common descent based on ... later in The Descent of Man ( 1871 ). This theory is now generally accepted by biologists, and the ...

Culture

... to a wider variety of societies. Attentive to the theory of evolution , they assumed that all human ... ( acculturation ). Diffusion of innovations theory presents a research-based model for how, when and ... invention in another. Diffusions of innovations theory presents a research-based model for why and when ...

Endosymbiont

... , originated as bacterial endosymbionts. This theory is known as the endosymbiotic theory , confirmed and popularized by Lynn Margulis . ... of the host insect cell. (A complementary theory as to why the bacteria may have lost genes, ...

Endosymbiont

... , originated as bacterial endosymbionts. This theory is known as the endosymbiotic theory , confirmed and popularized by Lynn Margulis . ... of the host insect cell. (A complementary theory as to why the bacteria may have lost genes, ...

Endosymbiotic theory

... The endosymbiotic theory concerns the origins of mitochondria and ... which came to live inside eukaryotic cells. The theory postulates that the mitochondria evolved from ... (autotrophic prokaryotes). The evidence for this theory is compelling as a whole, and it is now generally ...

Enzyme

... and Maud Menten proposed a quantitative theory of enzyme kinetics which is still widely used ... model of enzyme catalysis The lecture "Quantum theory of some Biochemical Reactions", presented to the ... A.K. Madumarov, Z.D. Urushadze, Yu.I. Kharkats. theory of Enzyme Catalysis.- Molekuliarnaya Biologia , ...

Epigenetics

... explain cell differentiation. They developed a theory that each undifferentiated cell underwent a ... Erik Erikson developed an epigenetic theory of human development which focuses on ... resolved is not; by analogy with the epigenetic theory of cell differentiation, the process was said to ...

Ernst Haeckel

... descent) have been named the " recapitulation theory ", summed up in the phrase, "ontogeny ... Haeckel was also known for his "biogenic theory ", in which he suggested that the development of ... are important to the history of evolutionary theory , and he was a competent invertebrate ...

Eugenics

... showTocToggle("show","hide") 1 Galton's theory 2 Eugenics and the state, 1890s-1945 3 ... 8.2 Pro-eugenics websites Galton's theory Selective breeding was suggested as early as ... the evolution of man and animals provided by the theory of his cousin Charles Darwin . After reading ...

Evolution

... from one generation to the next. Darwin's theory of evolution describes the descent of all living ... is often used as a shorthand for both the modern theory that all extant species share a common ancestor ... acts to change populations over time. This theory was updated in the twentieth century through the ...

Homunculus

... Homunculus arguments are common in the theory of vision. Imagine a person watching a movie. ... on the screen. How is this done? A simple theory might propose that the light from the screen ... person in the brain behind the cortex. In the theory of vision the Homunculus Argument invalidates ...

Jean-Baptiste Lamarck

... today mainly in connection with a discredited theory of heredity , the " inheritance of acquired ... of miraculous interposition." Lamarck's own theory of evolution was in fact based on the idea that ... widely refuted. August Weismann disproved the theory by cutting the tails off mice, demonstrating that ...

Louis Pasteur

... general public for his demonstration of the germ theory of disease and his development techniques of ... and the polarization of light 3 Germ theory 4 Immunology 5 Honors and assessment ... of the cole Normale Suprieure . Germ theory Louis Pasteur demonstrated that the ...

Lynn Margulis

... scientific contribution as the endosymbiotic theory of the origin of mitochondria as separate ... endosymbiosis . "She is best known for her theory of symbiogenesis , which challenges a central ... and co-developer of the modern version of Gaia theory , based on an idea developed by the English ...

Mendelian inheritance

... theories of genetics in 1865, the prevailing theory of biological inheritance was that of blending ... to form the pattern for the offspring. This theory accounted for the fact that offspring tended to ... themselves out. Mendel proposed instead a theory of particulate inheritance, in which ...

Mitochondrion

... genetic studies 4 The endosymbiotic theory 5 External links 6 See also ... 2004, pubmed #15143273 ). The endosymbiotic theory Main article: endosymbiotic theory Mitochondria are unusual among organelles in ...

Mitochondrion

... genetic studies 4 The endosymbiotic theory 5 External links 6 See also ... 2004, pubmed #15143273 ). The endosymbiotic theory Main article: endosymbiotic theory Mitochondria are unusual among organelles in ...

Molecular evolution

... Molecular study of phylogeny 2.4 The neutral theory 2.5 Infinite alleles model 2.6 Infinite ... of around 1000 base pairs . The neutral theory Main article: Neutral theory of molecular evolution One of the questions ...

Modern evolutionary synthesis

... , brings together Charles Darwin 's theory of the evolution of species by natural selection with Gregor Mendel 's theory of genetics as the basis for biological ... coined the term neo-Darwinism to refer to the theory of evolution preferred by Alfred Russel Wallace ...

Natural selection

... is the primary mechanism within the scientific theory of evolution , i.e. it alters the frequency ... field of ecology itself). Darwin's scientific theory of the evolution of species through natural ... a process called "individuation" by Darwin. This theory does not make any specific claims as to how this ...

Neutral theory of molecular evolution

... The neutral theory of molecular evolution (also, simply the neutral theory of evolution ) is an influential theory that was introduced with provocative effect by ...

Olfaction

... one functional odor receptor. According to shape theory , each receptor detects a feature of the odor ... will fire. However, according to Vibration theory , recently proposed by Turin (1996, 2002), odor ... cones of the eye . Currently, only vibration theory can explain why a molecule containing hydrogen ...

Operator

... extra data can be defined formally, using type theory ; but in everyday usage saying operator flags ... Linear operators 3.2 Operators in probability theory 3.3 Operators in calculus 3.3.1 The ... The expectation operator in probability theory , for example, has random variables as domain ...

Origin of life

... models 3 Other models 3.1 Clay theory of the origin of life 3.2 "Deep-hot biosphere" ... the most crucial challenge unanswered by this theory is how the relatively simple organic building ... Gnter Wchtershuser , in his iron-sulfur world theory . In this theory, he postulated the evolution of ...

Population genetics

... population structure in space. As such, it is the theory that attempts to explain such phenomena as ... space". The challenge of a complete theory of population genetics is to provide a set of ... In practice, there are two bodies of evolutionary theory that exist in parallel, traditional population ...

Punctuated equilibrium

... equilibrium , or punctuated equilibria , is a theory of evolution which states that changes such as ... change— equilibria —in between. This theory is one of the proposed explanations of the ... showTocToggle("show","hide") 1 The theory 2 Misconceptions 3 Compatibility with ...

Red Queen

... or " Red Queen's Race " is an evolutionary theory explaining the advantage of sex . By making ... the discussion of arms races in the biological theory of evolution by natural selection. The ... from the fact that the traditionally accepted theory ( The Vicar of Bray ) only showed adaptive ...

Sociobiology

... 1 Sociobiological theory 2 Controversy 3 Science and ... 6 External links Sociobiological theory Sociobiologists believe that animal or human ... focus on its evolutionary origins. If Darwin 's theory of natural selection is accepted, then inherited ...

Species

... as a fundamental stepping stone to the modern theory of adaptive mutation . Lamarck's long-discarded ... now consider the most powerful and compelling theory of evolution . Basically, Darwin argued that it ... selects the traits to be passed on. This is the theory of evolution by natural selection . In this ...

Thomas Malthus

... the poor in England. The influence of Malthus's theory of population was very great. Previously, high ... the Poor Law Amendment Act of 1834. Malthus's theory was also a key influence on both of the co-founders of modern evolutionary theory Charles Darwin and Alfred Russel Wallace . ...

Andrew Huxley

... experimental measurements on which the pair based their action potential theory represent one of the earliest applications of a technique of ... 1940s , after interruption by World War II . The pair published their theory in 1952 . He currently maintains his position as a fellow at Trinity ...

Extinction

... that 99.9% of all species that have ever lived are now extinct. In the theory of evolution , new species are created by speciation — where new ... The Skeptical Environmentalist Biodiversity Unified neutral theory of biodiversity Population genetics External links A ...

Genomics

... organisms, but not in other members of one of the clades, has led to the theory that these sequences were acquired by horizontal gene transfer . This ... and plastid proteins, giving support to the endosymbiotic theory of the origin of these organelles . Genetic similarity It is ...
Other Contents
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