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Pastimes
Evolution - Moderated

An SI Board Since December 2013

Posts	SubjectMarks	Bans
150	9	0

Emcee: Brian Sullivan	Type: Moderated

Introduction Compact

Evolution is the change in the inherited characteristics of biological populations over successive generations. Evolutionary processes give rise to diversity at every level of biological organisation, including species, individual organisms and molecules such as DNA and proteins.

All life on Earth is descended from a last universal ancestor that lived approximately 3.8 billion years ago. Repeated speciation and the divergence of life can be inferred from shared sets of biochemical and morphological traits, or by shared DNA sequences. These homologous traits and sequences are more similar among species that share a more recent common ancestor, and can be used to reconstruct evolutionary histories, using both existing species and the fossil record. Existing patterns of biodiversity have been shaped both by speciation and by extinction.

Charles Darwin was the first to formulate a scientific argument for the theory of evolution by means of natural selection. Evolution by natural selection is a process inferred from three facts about populations: 1) more offspring are produced than can possibly survive, 2) traits vary among individuals, leading to different rates of survival and reproduction, and 3) trait differences are heritable. Thus, when members of a population die they are replaced by the progeny of parents better adapted to survive and reproduce in the environment in which natural selection takes place. This process creates and preserves traits that are seemingly fitted for the functional roles they perform. Natural selection is the only known cause of adaptation, but not the only known cause of evolution. Other, nonadaptive causes of evolution include mutation and genetic drift.

No religious posts please.

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Reply	Message Preview	From	Recs	Posted
150	quantamagazine.org	MCHVE	1	10/11/2015
149	Worth repost: quantamagazine.org Becoming pretty obvious that Lamarck was also	MCHVE	2	10/11/2015
148	" bacteria are far more sophisticated than anyone imagined	MCHVE	-	10/10/2015
147	"Intended Evolution": books.google.com	MCHVE	-	10/9/2015
146	I've started a new thread dealing with the issues surrounding the interrel	Greg or e	-	9/13/2015
145	Disorder Rules the Universe‘The Quantum Moment’ Recounts the End of Determinism	2MAR$	-	2/18/2015
144	"Physical objects are not in space, but these objects are spatially extende	2MAR$	1	2/14/2015
143	Happy Darwin day to all. Let's celebrate rationalism and empiricism. "	2MAR$	1	2/12/2015
142	More of the story on yeast & bacteria, there are 10 times more microorgani	2MAR$	-	2/9/2015
141	There's a revolution afoot in the world of biotechnology. A technique called	Brian Sullivan	-	2/6/2015
140	Scientists discover organism that hasn’t evolved in more than 2 billion years. B	2MAR$	1	2/3/2015
139	Every civilized human being, whatever his conscious development, is still an arc	2MAR$	1	2/3/2015
138	Labyrinths as crucibles of life Water-filled micropores in hot rock may have ac	2MAR$	-	2/2/2015
137	Strange tale of fish eye evolution shows how new species could be born Jan 22,	Brian Sullivan	1	1/24/2015
136	Antarctic Sea Ice Reaches New Record Maximum, Emperor Penguin populations have	2MAR$	1	1/22/2015
135	Cane versus beet It is difficult to distinguish between fully refined sugar pro	Brian Sullivan	1	1/17/2015
134	Sweet! Deep-Space Sugars May Reveal Clues About Origins of Life livescience.com	2MAR$	-	1/17/2015
133	Plants versus ants- voracious vegetation is victorious reuters.com	Ron	-	1/13/2015
132	" Evolution: What Darwin Never Knew "..... one of the best documentari	2MAR$	-	1/1/2015
131	Climate change and human evolution- interactive chart from the Smithsonian hum	Ron	-	12/26/2014
130	Complexity science is about complex systems. A complex system is a highly nonlin	2MAR$	-	12/24/2014
129	A roundup of new animal discoveries: bugs.viralnova.com	Ron	-	12/24/2014
128	T-Rex was just a big Chicken ...... "Analysis of a shred of 68-million-year	2MAR$	-	12/18/2014
127	Based on 48 Genomes, New Avian Family Tree Provides Surprising Insights into Bir	Brian Sullivan	2	12/17/2014
126	At the time the Indian plate was rapidly moving northward towards the Eurasian p	Brian Sullivan	1	12/14/2014

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