After spending time on the islands, he soon developed a theory that would contradict the creation of man and imply that all species derived from common ancestors through a process called natural selection.
Neutral theory of molecular evolution
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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.
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.
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 ...
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.
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.
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.
Theory and Informatics
Crkvenjakov chaired a session that focused on the usefulness of reduced probe sets and additional biochemical data in SBH.
theory
[Gk. theorein, to look at]
A generalization based on many observations and experiments; a verified hypothesis.
thermodynamics ...
Theory
Hypotheses that have been tested by different investigators numerous times and have not been disproved become theory.
Experimental Design ...
cell theory One of the four (or five) unifying concepts in biology. The cell theory states that all living things are composed of at least one cell and that the cell is the fundamental unit of function in all organisms.
Cell theory
Main article: Cell theory
Cells in culture, stained for keratin (red) and DNA (green) ...
Neuron Theory."The nerve cell and its processes collectively constitute what is termed a neuron, and Waldeyer formulated the theory that the nervous system is built up of numerous neurons, ...
Theory of the development of organisms from the embryo by concatenating formation and changes in structure. Cf. preformation.
Related Terms:
Preformation ...
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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theory of evolution by natural selection A theory conceived by Charles Darwin and Alfred Russell Wallace on how some evolutionary changes occur.
CELL THEORY
1. All living things are constituted by cells.
2. Every cell proceeds from another cell (Biogenesis).
A second theory proposes that cellular building blocks were formed in deep-water hydrothermal vents rather than in puddles or lakes on the Earth's surface.
The Cell Theory
When Schleiden and Schwann proposed the cell theory in 1838, cell biology research was forever changed. The cell theory states that:
All life forms are made from one or more cells.
Cells only arise from pre-existing cells.
Coalescence theory: The evolutionary theory that estimates the time for divergence from the last common ancestor.
Coding sequence (cds): The portion of a gene that is transcribed into mRNA and translated into protein.
Optimal foraging theory. A theory designed to predict the foraging behavior that maximizes food intake per unit time
Organic. Deriving from living organisms ...
epigenesis - theory holding that development is a gradual process of increasing complexity.
According to this theory, about 15 billion years ago (15,000,000,000) the Universe was nothing more than a very small speck of mass. This speck was probably no bigger than the head of a pin.
Taxonomy: The theory and practice of describing, naming and classifying plants and animals. See also systematics.
Gradualism the theory that organisms evolve by slow‚ constant change
(gradus = a step‚ walk)
Gramineae also known as Poaceae‚ the plant family (in Class Monocotyledonae) commonly known as grasses
(gramin = grass) ...
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.
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, ...
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).
Darwin was familiar with the theory proposed by a contemporary economist (clergyman), Malthus.
With the acceptance of the chromosome theory, the term is applied to the breaking during meiosis of one maternal and one paternal chromosome, the exchange of corresponding sections of DNA, and the rejoining of the chromosomes.
Theory
- uses many observations and has loads of experimental evidence
- can be applied to unrelated facts and new relationships
- flexible enough to be modified if new data/evidence introduced
Law ...
evolution - a scientific theory that animals and plants originated from other preexisting types, with distinguishable differences being due to modifications in successive generations resulting from natural selection acting on variable characters ...
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 ...
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).
eukaryote, nucleus, nucleolus, endoplasmic reticulum, centriole, Golgi, cytoskeleton, mitochondria, vacuole, cell theory
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