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Braquel Burnett

http://history.hanover.edu/courses/excerpts/111dar.html - 1 views

    • Erin Hamson
       
      Selective breeding 
  • There is no obvious reason why the principles which have acted so efficiently under domestication should not have acted under nature.
    • Erin Hamson
       
      Logical Conclusion
  • With animals having separated sexes there will in most cases be a struggle between the males for possession of the females.
    • Erin Hamson
       
      One type of competition
  • ...14 more annotations...
  • No one can draw any clear distinction between individual differences and slight varieties; or between more plainly marked varieties and subspecies, and species.
  • why should we doubt that variations in any way useful to beings, under their excessively complex relations of life, would be preserved, accumulated, and inherited?
    • Erin Hamson
       
      Progression, in species rather than individual people.
  • The theory of natural selection, even if we looked no further than this, seems to me to be in itself probable. I have already recapitulated, as fairly as I could, the opposed difficulties and objections: now let us turn to the special facts and arguments in favour of the theory.
    • Erin Hamson
       
      It seems perfectly logical.
  • On the view that species are only strongly marked and permanent varieties, and that each species first existed as a variety, we can see why it is that no line of demarcation can be drawn between species, commonly supposed to have been produced by special acts of creation, and varieties which are acknowledged to have been produced by secondary laws. On this same view we can understand how it is that in each region where many species of a genus have been produced, and where they now flourish, these same species should present many varieties; for where the manufactory of species has been active, we might expect, as a general rule, to find it still in action; and this is the case if varieties be incipient species.
    • Erin Hamson
       
      Starting with the premise that species came from one, ie "first existed as a variety", if they were each distinctly created, then this logic is false, because the premise is false. 
  • preserve the most divergent offspring
  • Hence during a long-continued course of modification, the slight differences, characteristic of varieties of the same species, tend to be augmented into the greater differences characteristic of species of the same genus.
    • Erin Hamson
       
      How species come about.
  • New and improved varieties will inevitably supplant and exterminate the older, less improved and intermediate varieties; and thus species are rendered to a large extent defined and distinct objects.
    • Erin Hamson
       
      Extinction
  • This grand fact of the grouping of all organic beings seems to me utterly inexplicable on the theory of creation.
    • Erin Hamson
       
      The fact that there are relations among different species. 
  • But why this should be a law of nature if each species has been independently created, no man can explain.
  • As natural selection acts solely by accumulating slight, successive, favourable variations, it can produce no great or sudden modification; it can act only by very short and slow steps
    • Erin Hamson
       
      Where is the evidence for these short steps? 
  • The wonder indeed is, on the theory of natural selection, that more cases of the want of absolute perfection have not been observed.
  • As natural selection acts by competition, it adapts the inhabitants of each country only in relation to the degree of perfection of their associates;
    • Erin Hamson
       
      Imperfection of Nature
  • we believ
    • Erin Hamson
       
      STILL NEEDS FAITH?
  • Natura non facit saltum
    • Braquel Burnett
       
      It means "nature does not make jumps." (http://en.wikipedia.org/wiki/Natura_non_facit_saltus)
Morgan Wills

Johanna Schmitt: 'Natural Selection in an Age of Global Change' | Today at Brown - 0 views

  • A famous early example of natural selection in action was actually discovered right here in Providence by a Brown professor, Hermon Carey Bumpus. Passing by the Atheneum (just a few blocks from here on Benefit Street) after a severe blizzard in January 1898, Professor Bumpus found a flock of English house sparrows that had been knocked down by the storm. A typical scientist, he picked them all up and took them back to his lab, where some revived and some didn’t. When he measured them he discovered that the living were morphologically different from the dead. That was a case of natural selection acting in a single night!
  • Some of those experiments have already produced results — such as the rapid, pervasive, and dangerous evolution of antibiotic resistance in bacteria.
  • And a Gallup poll on Darwin’s birthday this February showed that only 39 percent of the American public overall “believes” in the theory of evolution.
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    I've always wondered if Natural Selection is different for humans in a day and age where debilitating physical characteristics don't always prevent humans from reproducing. I found this article and highlighted some interesting points.
Danny Patterson

Natural Selection Prezi - 0 views

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    Here's a fun, concise presentation with examples on how the natural selection principle works and has affected various species around the world.
Kevin Watson

On the Origin of Species By Means of Natural Selection, or, the Preservation ... - 0 views

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    Just a compilation of book reviews for "The Origin of Species" from Amazon.com. However, they are good reviews that explain some of the things that Darwin discussed in his book.
Kevin Watson

The Rare Orchids' Family History | BlogThePlanet - 0 views

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    Orchids are evidence of Natural Selection.
Jeffrey Whitlock

Theory of Evolution by Natural Selection by Clarinda Dodson on Prezi - 0 views

    • Jeffrey Whitlock
       
      This presentation gives a great overview of Theory of Evolution by Natural Selection
Jeffrey Chen

Gene positioning effects evolution - 0 views

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    "We usually think of natural selection as acting directly on the genes that influence a specific trait," said Leonid Kruglyak, one of the co-authors on the paper and the William R. Harman '63 and Mary-Love Harman Professor in Genomics at Princeton. "This paper shows that there is an indirect evolutionary force that can override this direct effect -- selection acting on neighboring genes that just happen to travel together on a chromosome with the genes that influence the trait."
Sarah Wills

The Darwin Awards - 0 views

shared by Sarah Wills on 18 Oct 10 - Cached
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    A modern day reporting of how natural selection works. Although some are funny (in a I-can't-believe-this-person-actually-did-that sort of way) I will admit that some of the stories on here are sad.
Sarah Wills

The Selfish Gene (Richard Dawkins)- Google Books - 0 views

shared by Sarah Wills on 18 Oct 10 - No Cached
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    Focuses the theory of natural selection not on the organism but on the genes. A very interesting read.
Andrew DeWitt

Modernism - Wikipedia, the free encyclopedia - 0 views

  • From the 1870s onward, the ideas that history and civilization were inherently progressive and that progress was always good came under increasing attack.
  • Darwin's theory of evolution by natural selection undermined the religious certainty
  • Karl Marx argued there were fundamental contradictions within the capitalist system
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  • The miseries of industrial urbanism and the possibilities created by scientific examination of subjects brought changes that would shake a European civilization which had, until then, regarded itself as having a continuous and progressive line of development from the Renaissance. With the telegraph's harnessing of a new power, offering instant communication at a distance, the experience of time itself was altered.
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