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#91
12-07-2006, 08:43 PM
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Re: What prevents evolution?
[ QUOTE ]
[ QUOTE ] [ QUOTE ] [ QUOTE ] [ QUOTE ] [ QUOTE ] At some point inthe future either population A or poulation B will constitute 100% of the population. This is genetic drift due to randomness in the environment, as long as there is a differnece in reproductive success there will be change, it requires a mechanism to stop what would otherwise become a mathenmatical certainty given enough permeations. [/ QUOTE ] One mechanism that stops this completely hypothetical process from occurring in the real world is the increasing infertility among the members of the genetically drifting population that accompanies their individual divergence from the original stock. [/ QUOTE ] So...speciation prevents evolution? Extinction prevents evolution? [/ QUOTE ] Speciation causes infertility. [/ QUOTE ] I think you're backwards there. Also, how do individuals become infertile with each other? [/ QUOTE ] Mutation, of course. [/ QUOTE ] Please elaborate. 
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#92
12-07-2006, 09:02 PM
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Re: What prevents evolution?
The divergence that differentiates, in terms of reproductive compatibility, progenitor species A from descendant species B would also occur among the members of the latter population.
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#93
12-07-2006, 09:19 PM
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Re: What prevents evolution?
[ QUOTE ]
The divergence that differentiates, in terms of reproductive compatibility, progenitor species A from descendant species B would also occur among the members of the latter population. [/ QUOTE ] Among the members how? Also, what is your stance on evolution? I thought you were going one way but may be wrong.
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#94
12-07-2006, 11:42 PM
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Re: What prevents evolution?
[ QUOTE ]
[ QUOTE ] The divergence that differentiates, in terms of reproductive compatibility, progenitor species A from descendant species B would also occur among the members of the latter population. [/ QUOTE ] Among the members how? Also, what is your stance on evolution? I thought you were going one way but may be wrong. [/ QUOTE ] Among the members, it's the same process, simultaneously, as between the species. My position on evolution is that of a skeptic. Plus, it's an interesting topic of debate.
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#95
12-07-2006, 11:48 PM
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Re: What prevents evolution?
[ QUOTE ]
[ QUOTE ] [ QUOTE ] The divergence that differentiates, in terms of reproductive compatibility, progenitor species A from descendant species B would also occur among the members of the latter population. [/ QUOTE ] Among the members how? Also, what is your stance on evolution? I thought you were going one way but may be wrong. [/ QUOTE ] Among the members, it's the same process, simultaneously, as between the species. My position on evolution is that of a skeptic. Plus, it's an interesting topic of debate. [/ QUOTE ] But you said this: [ QUOTE ] The divergence that differentiates, in terms of reproductive compatibility, progenitor species A from descendant species B would also occur among the members of the latter population. [/ QUOTE ] How are you a skeptic then?
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#97
12-08-2006, 12:17 AM
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Re: What prevents evolution?
I'm a skeptic who's referring to, without necessarily agreeing upon, a hypothetical process, skeptically.
What process? Whichever you propose in explanation of a supposed speciation from A to B. Call it mutation and selection, if you like. Another try at rephrasing: One mechanism that stops the hypothetical process of speciation from occurring in the real world is an increasing infertility among the members of the genetically drifting population that accompanies their individual divergences from the original stock. That is, the same reproductive incompatibility that differentiates progenitor species A from descendant species B would also occur among the members of the latter population.
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