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Evolution: Speciation Change

  1. Oct 9, 2007 #1
    Okay I have a question. In micro-evolution, traits change among the same species, enough of these changes leads to macro-evolution. What is macro-evolution other than a different name and a series of small changes? A change big enough so that the new organism is no longer of the same species, and cannot mate with the original species anymore. This makes me question something...

    Mutations would only affect one organism, correct? It would be too coincidental for a group of organisms to all evolve into the same new species. So how does the new species reproduce if it's not asexual? If it's the only one of it's kind? If it could reproduce with the parent species, then it would BE that species itself, so how does a new organism representing a new species reproduce?
     
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  3. Oct 9, 2007 #2

    russ_watters

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    Mutated organisms (may) pass their new traits on to their kids.
    It isn't that thin of a line. Species may just evolve in parallel, isolated from each other, eventually becoming incompatible.
     
  4. Oct 11, 2007 #3
    Evolution is a long term process, I personally don't believe species could just arise through a sudden change that makes it completely incompatible with its predecessors. Usually an advantageous mutation is selected upon and passed onto future generations long enough to allow the specialization of that trait, but this takes time.
     
  5. Oct 11, 2007 #4
    Yes, evolution does indeed proceed through gradualism.
     
  6. Oct 11, 2007 #5

    Evo

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    http://news.bbc.co.uk/1/hi/sci/tech/979950.stm
     
  7. Oct 11, 2007 #6
  8. Oct 11, 2007 #7

    Moonbear

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    Evolution is evolution. The distinction between micro and macro evolution is not one made by biology so much as those who wish to reject evolution, but need to make some concession to the fact that mutations do indeed occur that change species, so they give it a different name.

    The mutation would have to occur in the germ cells (egg or sperm), not just somatic cells (the rest of the body) for it to be passed on to the next generation, and be spread throughout a species.
     
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