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Revision as of 18:26, 21 November 2009 by ( | )
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In , a group of have common descent if they have a common . According to modern , all living organisms on are descended from a common ancestor or ancestral .<ref>The earliest life-like forms probably exchanged laterally in a manner that is analogous to (also called lateral gene transfer) amongst . For this and other reasons, the most recent common ancestor may have been a genetic pool rather than an organism.
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</ref>

proposed his theory of universal common descent through an process in his (1859), and later in (1871). This theory is now generally accepted by . The (LUA) (or last universal common ancestor, LUCA), that is, the of all currently living organisms, is believed to have appeared about .

In , coined the word concestor, as a substitute for common ancestor or most recent common ancestor. This new word is very gradually entering scientific parlance.<ref></ref>

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In 1745, made the first known, documented suggestion that all organisms may have had a common ancestor and diverged through random variation and in his work Vénus physique:

Could one not say that, in the fortuitous combinations of the productions of nature, as there must be some characterized by a certain relation of fitness which are able to subsist, it is not to be wondered at that this fitness is present in all the species that are currently in existence? Chance, one would say, produced an innumerable multitude of individuals; a small number found themselves constructed in such a manner that the parts of the animal were able to satisfy its needs; in another infinitely greater number, there was neither fitness nor order: all of these latter have perished. Animals lacking a mouth could not live; others lacking reproductive organs could not perpetuate themselves ... The species we see today are but the smallest part of what blind destiny has produced ...
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In 1790, wrote in Kritik der Urtheilskraftthat the analogy of animal forms implies a common original type, and thus a common parent.
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In 1795, Charles Darwin's grandfather, , asked:

[W]ould it be too bold to imagine, that in the great length of time, since the earth began to exist, perhaps millions of ages before the commencement of the history of mankind, would it be too bold to imagine, that all warm-blooded animals have arisen from one living filament, which endued with animality, with the power of acquiring new parts attended with new propensities, directed by irritations, sensations, volitions, and associations; and thus possessing the faculty of continuing to improve by its own inherent activity, and of delivering down those improvements by generation to its posterity, world without end?<ref></ref>

In 1859, Charles Darwin's The Origin of Species was published. The views about common descent expressed therein were that there were at most five progenitors each for plants and animals, thus at most ten in all, but possibly even only one for all life forms. Darwin stated them in the book's Conclusions:

I believe that animals have descended from at most only four or five progenitors, and plants from an equal or lesser number.<ref>p410 The Origin of Species first edition, reprinted by Watts and Co 1950 </ref>
[P]robably all the organic beings which have ever lived on this earth have descended from some one primordial form, into which life was first breathed.<ref>ibid</ref>
The whole history of the world, as at present known, ... will hereafter be recognized as a mere fragment of time, compared with the ages which have elapsed since the first creature, the progenitor of innumerable extinct and living descendants, was created.<ref>ibid p411</ref>
When I view all beings not as , but as the lineal descendants of some few beings which lived long before the first bed of the system was deposited, they seem to me to become ennobled.
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Darwin's famous closing sentence describes the "grandeur in this view of life, with its several powers, having been originally breathed into a few forms or into one."
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All known forms of life are based on the same fundamental biochemical organisation: genetic information encoded in , transcribed into RNA, through the effect of protein- and RNA-, then translated into by (highly similar) ribosomes, with ATP, NADH and others as energy sources, etc. Furthermore, the (the "translation table" according to which DNA information is translated into proteins) is nearly identical for all known lifeforms, from to . The universality of this code is generally regarded by biologists as definitive evidence in favor of the theory of universal common descent. Analysis of the small differences in the genetic code has also provided support for universal common descent.<ref></ref>

Selectively neutral similarities

Similarities which have no relevance to evolution and therefore cannot be explained by convergence, tend to be very compelling support for the universal common descent theory.

Such evidence has come from two domains: amino acid sequences and DNA sequences. Proteins with the same three-dimensional structure need not have identical sequences; any irrelevant similarity between the sequences is evidence for common descent. In certain cases, there are several (DNA triplets) that code for the same amino acid. Thus, if two species use the same codon at the same place to specify an amino acid that can be represented by more than one codon, that is evidence for a recent common ancestor.

Other similarities

The universality of many aspects of cellular life is often pointed to as supportive evidence to the more compelling evidence listed above. These similarities include the energy carrier (ATP), and the fact that all amino acids found in proteins are left-handed. It is possible that these similarities resulted because of the laws of physics and chemistry, rather than universal common descent and therefore resulted in .

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Another important piece of evidence is that it is possible to construct detailed (that is, "genealogic trees" of species) mapping out the proposed divisions and common ancestors of all living species. Traditionally, these trees have been built using morphological methods, such as appearance, , etc. Recently, it has been possible to construct these trees using molecular data, based on similarities and differences between genetic and protein sequences. All these methods produce essentially similar results, even though that most has no influence over external morphology. That phylogenetic trees based on different types of information agree with each other is strong evidence of a real underlying —that is, common descent.<ref></ref>

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demonstrates the diversity that can exist among organisms that share a relatively recent common ancestor. In artificial selection, one species is bred selectively at each generation, allowing only those organisms that exhibit desired characteristics to reproduce. These characteristics become increasingly well-developed in successive generations. Artificial selection was successful long before science discovered the genetic basis.
The and illustrate the range of sizes among dog breeds.
Dog breeding

The diversity of domesticated is an example of the power of artificial selection. All breeds share common ancestry, having descended from . Humans selectively bred them to enhance specific characteristics, such as color and length or body size. This created a range of breeds that include the , , , , and . Wild wolves, which did not undergo artificial selection, are relatively uniform in comparison.

Wild cabbage
Wild Cabbage plant

Early farmers cultivated many popular vegetables from the (wild cabbage) by artificially selecting for certain attributes. Common vegetables such as , , , , and are all descendants of the wild cabbage plant.<ref></ref> Brussels sprouts were created by artificially selecting for large size. Broccoli was bred by selecting for large stalks. Cabbage was created by selecting for short . Kale was bred by selecting for large .

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Darwin's finches

Natural selection is the evolutionary process by which traits that increase an individual's fitness become more common, and heritable traits that decrease an individual's fitness become less common.

Darwin's finches

During 's studies on the , Darwin observed 13 species of that are closely related and differ most markedly in the shape of their . The beak of each is suited to the food available in its particular environment, suggesting that beak shapes evolved by . Large beaks were found on the islands where the primary source of food for the finches is and therefore the large beaks allowed the birds to be better equipped for opening the nuts and staying well nourished. Slender beaks were found on the finches which found to be the best source of food on the island they inhabited; their slender beaks allowed the birds to be better equipped for pulling out the insects from their tiny hiding places. The finch is also found on the main land and it is thought that they to the islands and began to their environment through .

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