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David Bono-Raftopoulos

Darwin's Theory - 0 views

bioweb.cs.earlham.edu/...theory.html

shared by David Bono-Raftopoulos on 09 Dec 11 - Cached
  • the search for a mechanism of evolution. The first was Jean Lamarck. The second was one of the greatest figures in biology, Charles Darwin.
  • mechanism
  • mechanism
  • ...33 more annotations...
  • Assume that there were salamanders living in some grasslands. Suppose, Lamarck argued, that these salamanders had a hard time walking because their short legs couldn't trample the tall grasses or reach the ground. Suppose that these salamanders began to slither on their bellies to move from place to place. Because they didn't use their legs, the leg muscles wasted away from disuse and the legs thus became small.
  • passed this acquired trait
  • legless salamanders evolved
  • no legs.
  • by inheriting the acquired characteristic of
  • Darwin's Background
  • o have extraordinary talents.
  • genius, did not at first appear
  • Darwin disliked school
  • d observing birds and collecting insects to study.
  • sent to medical school in Scotland
  • "intolerably dull
  • interested in attending natural history lectures.
  • university at Cambridge, England, in 1827.
  • Darwin be chosen for the position of naturalist on the ship the HMS Beagle.
  • to collect specimens, make observations, and keep careful records of anything he observed that he thought significant.
  • Principles of Geology by Charles Lyell,
  • In the Andes he observed fossil shells of marine organisms in rock beds at about 4,300 m.
  • One reason that Darwin was so eager to study life on land was that he suffered from terrible seasickness and couldn't wait to get off the Beagle.
  • thousands
  • trekked hundreds of miles through unmapped region.
  • catalog his specimens and write his notes.
  • praised by the scientific community.
  • experts for study.
  • bird specialist
  • Darwin's bird collections from the Galapagos Islands, located about 1,000 km west of South America.
  • 13 similar
  • Other experts
  • believe that species change over time.
  • evidence f
  • In 1837 Darwin began his first notebook on evolution. For several years Darwin filled his notebooks with facts that could be used to support the theory of evolution.
  • fossils of similar relative ages are more closely related than those of widely different relative ages.
  • He ran his own breeding experiments and also did experiments on seed dispersal.
  • David Bono-Raftopoulos on 09 Dec 11
     
    Very interesting document, it is a credible site, and has multiple pages of information about Darwin's Theory of Evolution. Helped me quite a bit for my TFAD assignment. 
David Bono-Raftopoulos

Stone tools influenced hand evolution in human ancestors, anthropologists say - 0 views

www.sciencedaily.com/...110307101504.htm

shared by David Bono-Raftopoulos on 09 Dec 11 - No Cached
  • features in the bones and musculature of the human hand and wrist associated with specific gripping and manipulatory capabilities that are different from those of other extant great apes
  • confirmed Charles Darwin's speculation that the evolution of unique features in the human hand was influenced by increased tool use in our ancestors.
  • humans split from the last common ancestor
  • ...6 more annotations...
  • Africa a
  • ow, researchers Dr Stephen Lycett and Alastair Key have shown that the hands of our ancestors may have been subject to natural selection as a result of using simple cutting tools
  • apes,
  • 2.6 million years ago,
  • show that 'biometric' variation
  • Darwin proposed that the use of stone tools may have influenced the evolution of human hands.
  • David Bono-Raftopoulos on 09 Dec 11
     
    Quite Interesting, and quite helpful.
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