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Contents contributed and discussions participated by David Bono-Raftopoulos

David Bono-Raftopoulos

Evolution and the Fossil Record by John Pojeta, Jr. and Dale A. Springer - 1 views

    • David Bono-Raftopoulos
       
      Some cool examples in the second statment
  • Competition exists among individuals.
  • The organisms whose variations best fit them to the environment are the ones who are most likely to survive, reproduce, and pass those desirable variations on to the next generation.
  • ...28 more annotations...
  • Competition
  • simple
  • Hair and eye color may be such neutral variations in human beings
  • variations a
  • antelope’s speed m
  • water retention in a desert plant
  • survive to maturity
  • favorable variations
  • passed from generation to generation natural selection.
  • relationship
  • simply by looking at it.
  • “survival of the fittest.”
  • “Fittest” means that organisms must not only survive to adulthood, they must actually reproduce.
  • advantageous genetic variations are passed along and become represented with increasing frequency in succeeding generations.
  • breeding programs.
  • Canis familiaris
  • several discipline
  • The Chihuahua
  • Saint Bernard
  • breeding programs.
  • Artificial selection
  • the same gene pool
  • the ability to interbreed and produce fertile offspring.
  • “man’s best friend.”
  • 20 years
  • natural selection.
  • example,
  • Organisms produce more offspring than the environment can support
David Bono-Raftopoulos

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

  • 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
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  • 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.
  •  
    Quite Interesting, and quite helpful.
David Bono-Raftopoulos

Darwin's Theory - 0 views

  • 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
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  • 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.
  •  
    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. 
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