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Evolution

Definition

noun, plural: evolutions

(1) The change in genetic composition of a population over successive generations, which may be caused by natural selection, inbreeding, hybridization, or mutation.

(2) The sequence of events depicting the evolutionary development of a species or of a group of related organisms; phylogeny.


Supplement

In order for evolution to occur, there must be genetic variation. Genetic variation brings about evolution. Without it there will be no evolution. There are two major mechanisms that drive evolution. First is natural selection. Individuals with advantageous traits are more likely to reproduce successfully, passing these traits to the next generation. This kind of evolution driven by natural selection is called adaptive evolution. Another mechanism involves genetic drift, which produces random changes in the frequency of traits in a population. Evolution that arises from genetic drift is called neutral evolution.


Word origin: Latin evolutio (“an unrolling, unfolding”), ex- (“from, out of”) + volere (“to roll”).

See also: Darwinism.

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Re: Evolution of the Face and Head

If 2 advantageous mutations (A and B) arise in a population, I understand that an individual with A could mate with a B mutant. Some of their offspring could have both mutations. In an example where these 2 mutations lie on the same chromosome at different loci, I understand that through recombinati...

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by Draco02
Wed Mar 25, 2015 12:03 pm
 
Forum: Evolution
Topic: Evolution of the Face and Head
Replies: 5
Views: 5215

What sort of jobs can one get with a biology degree ?

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by KF81
Tue Mar 24, 2015 7:00 pm
 
Forum: General Discussion
Topic: What sort of jobs can one get with a biology degree ?
Replies: 3
Views: 139

What sort of jobs can one get with a biology degree ?

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by KF81
Sat Mar 21, 2015 6:54 pm
 
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Topic: What sort of jobs can one get with a biology degree ?
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Views: 139

Re: Am I the Next Step in Human Evolution?

... i ask those exact questions but everyone just laughs and says: no son you're just bla bla bla. i do believe we are possibly the next step in human evolution.

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by NumnumGaming
Thu Feb 19, 2015 7:11 pm
 
Forum: Evolution
Topic: Am I the Next Step in Human Evolution?
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Views: 44966

Why do Africans have large noses and lips?

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by Steven2015
Tue Feb 10, 2015 2:55 am
 
Forum: Human Biology
Topic: Why do Africans have large noses and lips?
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