Dreadnought's favorite evolution pages, page 1

Last login: 11 hours agoDreadnought: Dreadnought is a 28 year old married guy from Pennsylvania, USA.; Likes 899 pages, 21 videos, 9 photos • 96 fans • Received 19 reviews; Member since Mar 25, 2005

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Genomicron: Natural selection before Darwin.: Jul 19, 2:35pm 0 review evolution
http://genomicron.blogspot.com/2008/07/charles-darwin-1809-1882-opened-his.html

Evolution: Apr 17, 7:21pm 8 reviews evolution
http://www.pbs.org/wgbh/evolution/index.html

DNA and Mutations: Apr 7, 9:55pm 0 review evolution
http://evolution.berkeley.edu/evolibrary/article/0_0_0/mutations_01

Evolution: Videos for Students: Evolving Ideas: Apr 7, 8:58pm 1 review evolution
http://www.pbs.org/wgbh/evolution/educators/teachstuds/svideos.html

ENSI/SENSI: Evolution/Nat.of Sci.Home Page2: Sep 3, 2007 7:01pm 2 reviews evolution
http://www.indiana.edu/~ensiweb/home.html; A lot of good lesson plans here for teaching evolutionary biology and the nature of science.

Seed: Prime Vertebrae: Aug 2, 2007 11:55am 3 reviews evolution
http://www.seedmagazine.com/news/2007/08/prime_vertebrae.php

Pharyngula: Sam Brownback, defender of the faith: May 31, 2007 6:16pm 0 review evolution
http://scienceblogs.com/pharyngula/2007/05/sam_brownback_defender_of_the.php

chimpanzee cultures: May 31, 2007 4:36pm 1 review evolution
http://culture.st-and.ac.uk:16080/chimp/

Pharyngula: Evolution of a polyphenism: Mar 25, 2007 6:22am 2 reviews evolution
http://scienceblogs.com/pharyngula/2006/02/evolution_of_a_polyphenism.php; PZ Meyers writes about the evolutionary phenomenons of genetic assimilation and accommodation at both his blog Pharyngula and SEED Magazine. Meyers describes a particularly elegant set of experiments that demonstrate how selection can act upon invisible variation within a population to evolve flexible developmental adaptations for a species. A polyphenic trait is a trait for which multiple, discrete phenotypes can arise from a single genotype as a result of differing environmental conditions. A polyphenism is a biological mechanism that causes a trait to be polyphenic. Naysayers of evolution would argue that a polyphenism would be impossible to evolve because it requires "sophisticated genetic control elements that sense elements of the environment and selectively activate different sets of genes depending on the conditions." Putting it that way does makes it sound unlikely and tricky to evolve. However, as Meyers points out, "all phenotypes are conditionally sensitive and dependent on interactions between genes and between genes and the environment--the control elements aren't novel introductions, they're already there! The evolution of polyphenic traits may be more a matter of shifting conditional responses quantitatively in particular directions." The work described by Meyers here empirically shows how a polyphenism evolved in the large caterpillar of the moth Manduca sexta . This species lacks the polyphenism in nature while a closely related species already had it.