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Thread: Problems with the gene-centered speciation theory.

  1. #1 Problems with the gene-centered speciation theory. 
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    The theory that reproductive species barriers comes from gradual accumulation of mutations predicts that it should be possible to accurately calculate the exact degree of hybridization barriers from just a percent number with a point and a few decimals. But studies of various organisms and their gene sequences, as well as irradiation experiments on fruit flies, shows that such is not the case. The mutation accumulation theory of reproductive barriers also predicts that large populations (with minimal genetic drift) should spontaneously die out after a while when accumulation of individual genetic variation makes them all sterile, and that is not the case either.

    The theory of sudden speciation by single key mutations instead have the problem of how the first individual with it should find a mate. The problem can certainly not be solved within the context of random mutation theory.

    So both the gradualist and the sudden version of gene-centered speciation theory is wrong unless mutations are non-random, and even non-random mutations imply something other than genetics changing genetics. So the gene-centered speciation theory is wrong all the way.


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  3. #2  
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    Quote Originally Posted by Martin J Sallberg View Post
    The theory that reproductive species barriers comes from gradual accumulation of mutations predicts that it should be possible to accurately calculate the exact degree of hybridization barriers from just a percent number with a point and a few decimals. But studies of various organisms and their gene sequences, as well as irradiation experiments on fruit flies, shows that such is not the case.
    Where does it predict any such specificity?

    Quote Originally Posted by Martin J Sallberg View Post
    The mutation accumulation theory of reproductive barriers also predicts that large populations (with minimal genetic drift) should spontaneously die out after a while when accumulation of individual genetic variation makes them all sterile, and that is not the case either.
    Why should this be the case? The large population is till interbreeding with neutral and beneficial mutations spreading though the population.


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    The theory that reproductive species barriers comes from gradual accumulation of mutations predicts that it should be possible to accurately calculate the exact degree of hybridization barriers from just a percent number with a point and a few decimals.
    and -

    The mutation accumulation theory of reproductive barriers also predicts that large populations (with minimal genetic drift) should spontaneously die out after a while when accumulation of individual genetic variation makes them all sterile, and that is not the case either.

    Could you provide a link to an account of/references for these theories?

    I don't think you have shown that speciation because of changed genetics can't work. I suspect an incomplete grasp of the processes involved.
    Last edited by Ken Fabos; April 27th, 2013 at 10:42 PM.
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