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Extinction event



An event in geologic time that depicts of the extinction of one of more species in a relatively short period, usually as a consequence of a catastrophic global event, a natural disaster, or an abrupt change in the environment, and based on studies of fossil records and macroscopic evidence.


Examples include Permian extinction of marine species, and Cretaceous extinction of various species, including dinosaurs.


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Microevolution verus Macroevolution

... carry exactly the same version of the gene. Another useful example is extinction, in which the frequency of all alleles in a species go from some ... there is a beautiful example of extinction and speciation in a single event, namely an extinction event in a ring species. If a selection of sub-species ...

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by hackenslash
Thu Mar 06, 2014 8:57 am
Forum: Evolution
Topic: Microevolution verus Macroevolution
Replies: 16
Views: 25925

Genome duplication

... alive today undergone whole genome duplications. Presumably, these events occurred to prevent extinction of those species which threatened those species after diversification event(http://mbe.oxfordjournals.org/content/23/5/887.full.pdf+html). ...

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by Cat
Sun Oct 14, 2012 5:07 pm
Forum: Evolution
Topic: Genome duplication
Replies: 0
Views: 1201

Re: Theories - Origin of Life

... read it!) t hat natural selection is about the differential survival or extinction of species .’’’” DYSON: Good. Yes, I have two responses. First, ... from the recent discussion “Life what a concept” at the Edge Special Event. http://www.edge.org/documents/life/life_index.html You will need to ...

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by scottie
Fri Oct 14, 2011 1:18 pm
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 563
Views: 1128029

Photosynthesis Theory..

... oxygen, were essentially responsible for what was likely the largest extinction event in Earth's history. Additionally the free oxygen combined with atmospheric methane, triggering ...

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by bellyjelly
Tue Jul 12, 2011 10:06 am
Forum: Botany Discussion
Topic: Photosynthesis Theory..
Replies: 12
Views: 15400

Re: closest relative of dinosaurs

... These adaptive niches probably opened up post the Permian–Triassic extinction event. Create a terrarium rich in oxygen and reproduce reptiles and birds parthenogenetically! ...

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by enarees
Sat Aug 21, 2010 5:09 am
Forum: Evolution
Topic: closest relative of dinosaurs
Replies: 18
Views: 10907
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