Theory

Theory: (?), n.; pl. Theories (#). 1. A doctrine, or scheme of things, which terminates in speculation or contemplation, without a view to practice; hypothesis; speculation.
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chromosome theory of inheritance
the established theory that genes are linked to chromosomes and that chromosomes are the carriers of the genetic material
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row ...
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A theory to account for the high degree of antibody variability found in population. The germ-line theory suggests that every B lymphocyte has all the genes for every type of immunoglobulin but transcribes only one. See somatic mutation theory.
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The neutral theory of molecular evolution (also, simply the neutral theory of evolution) is an influential theory that was introduced with provocative effect by Motoo Kimura in the late 1960s and early 1970s.
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The endosymbiotic theory, now generally accepted by biologists, concerns the origins of mitochondria and plastids (e.g. chloroplasts), which are organelles of eukaryotic cells.
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Well evolution is a theory. It is also a fact. And facts and theories are different things, not rungs in a hierarchy of increasing certainty. Facts are the world's data. Theories are structures of ideas that explain and interpret facts.
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Testing the Chemiosmosis Theory
Several kinds of evidence support the chemiosmotic theory of ATP synthesis in chloroplasts.
Link to discussion of the chemiosmosis in chloroplasts.
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Theory that every germ cell contains the organism of its kind fully formed and that development involves merely an increase in size. Cf. epigenesis.
Related Terms: Epigenesis ...
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theory A hypothesis that has withstood extensive testing by a variety of methods, and in which a higher degree of certainty may be placed. A theory is NEVER a fact, but instead is an attempt to explain one or more facts.
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theory
[Gk. theorein, to look at]
A generalization based on many observations and experiments; a verified hypothesis.
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Theory
Hypotheses that have been tested by different investigators numerous times and have not been disproved become theory.
Experimental Design ...
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theory: a hypothesis that is confirmed through repeated experimentation.
thrombocytes: the starting material for blood clotting; also called platelets.
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Theory of DNA Repair in Deinococcus
A depiction of the DNA repair process that Jonathon Eisen postulates might be happening in Deinococcus radiodurans after it is exposed to radiation.
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Tilman's Experimental Plots ...
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theory of evolution by natural selection A theory conceived by Charles Darwin and Alfred Russell Wallace on how some evolutionary changes occur.
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(theory of kin selection): In an altruistic act, if the donor sustains cost C, and the receiver gains a benefit B as a result of the altruism, then an allele that promotes an altruistic act in the donor will spread in the population if B/C >1/r or ...
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This theory was confirmed in the 1980s when scientists observed jumping DNA in other genomes. Now scientists believe transposons may be linked to some genetic disorders such as hemophilia, leukemia, and breast cancer.
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epigenesis - theory holding that development is a gradual process of increasing complexity.
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Optimal foraging theory. A theory designed to predict the foraging behavior that maximizes food intake per unit time
Organic. Deriving from living organisms ...
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Ecological succession: (according to the original theory): the development of an ecosystem through a predictable series of communities until a final, stable community (the climax community) in balance with the regional climate is attained.
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Pauling first described the a-helix nearly 50 years ago, yet new features of its structure continue to be discovered, using peptide model systems, sitedirected mutagenesis, advances in theory, ...
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Charles Darwin established evolution as a viable theory by articulating its driving force: natural selection. (Alfred Russell Wallace is commonly recognized as the co-discoverer of this concept).
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The theory that introns serve an evolutionary function in allowing the shuffling of exons is still being debated.
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In theory, the more species involved in the comparison, the more stringent the result can be (i.e. the more the conserved regions will reflect truly important sequences).
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Rigid parts of the Earth's crust and part of the Earth's upper mantle that move and adjoin each other along zones of seismic activity. The theory that the crust and part of the mantle are divided into plates that interact with each other causing ...
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-ism theory, characteristic of iso- equal, same isoelectric focusing An electrophoretic method for separating macromolecules on the basis of their pI.
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