Difference between revisions of "Mutation"

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(removed uncited material that was inappropriately at the start of article)
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In [[biology]]''' mutation''' is any physical change in the [[genetic material]] of an [[organism]]. In most cases this is either the [[DNA]] or [[RNA]] in the cell [[nucleus]]. In multicellular organisms there are two primary classes of mutation, [[germline mutations]] and [[somatic mutations]]. Germline mutations are those changes that can be passed down to offspring, while somatic mutations are mutations that only alter genetic material in the mutated organism. There is some evidence that changes outside of the cell's genetic material, such as the [[cytoplasm]], [[proteins]], or the cell [[membrane]] can also be inherited.  
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In [[biology]]''' mutation''' is any physical change in the [[genetic material]] of an [[organism]].  
  
 
Mutations can be caused by internal or external factors. Common external factors include [[ultraviolet]] radiation, chemical [[mutagens]], or parasitic organisms (such as [[viruses]] or [[bacteria]]). Most internal causes of mutations stem from errors in reproduction of genetic material. Most of these errors are corrected by error-correcting [[ribosomes]].
 
Mutations can be caused by internal or external factors. Common external factors include [[ultraviolet]] radiation, chemical [[mutagens]], or parasitic organisms (such as [[viruses]] or [[bacteria]]). Most internal causes of mutations stem from errors in reproduction of genetic material. Most of these errors are corrected by error-correcting [[ribosomes]].
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Some organisms will respond to harsh environments by increasing the rate of mutations. This is known as [[hypermutation]] and is hypothesized to aid organisms by creating wider variation in the [[gene pool]] of the population, increasing the chances that at least some decedents might survive under harsh conditions. 
 
  
 
==References==
 
==References==

Revision as of 23:35, June 13, 2007

In biology mutation is any physical change in the genetic material of an organism.

Mutations can be caused by internal or external factors. Common external factors include ultraviolet radiation, chemical mutagens, or parasitic organisms (such as viruses or bacteria). Most internal causes of mutations stem from errors in reproduction of genetic material. Most of these errors are corrected by error-correcting ribosomes.

References

Biology (7th Edition). Neil A. Campbell,Jane B. Reece. http://www.amazon.com/Biology-7th-Neil-Campbell/dp/080537146X.

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