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Author Topic:   PZ Myers vs. Adaptationism
AZPaul3
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Posts: 7465
From: Phoenix
Joined: 11-06-2006
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Message 15 of 49 (763220)
07-22-2015 3:05 PM
Reply to: Message 9 by MrHambre
07-22-2015 10:34 AM


Re: Spandrels and Storytelling
but no one is disputing that adaptive features are the result of natural selection.
Maybe I'm reading this wrong but isn't this exactly what Prof. M is disputing? Adaptationists insist there is a fitness value to all adaptations in your body or they wouldn't be there. This leads most adaptationists to posit selective pressures (natural selection) on the most flimsy of bases.
What Prof. M is saying, by my reading, is that having or not having a nose may be a major adaptation which helps define a species and is a major selective determinant in passing through the sieve of natural selection (fitness), but the (beautiful) angle of the bridge of his nose has little to no selective value to fitness and this adaptation merely drifts through the future population as a function of the probabilities in meiosis and fecundity.
Not all adaptations are the result of natural selection. The majority of the cosmetic features we see in a human phenome are adaptions born of mutation, have little to no selective value for fitness and increase or decrease their presence in a population by drift alone, not natural selection.
Edited by AZPaul3, : cuz

This message is a reply to:
 Message 9 by MrHambre, posted 07-22-2015 10:34 AM MrHambre has replied

Replies to this message:
 Message 16 by MrHambre, posted 07-22-2015 3:26 PM AZPaul3 has seen this message but not replied
 Message 18 by Taq, posted 07-22-2015 4:00 PM AZPaul3 has seen this message but not replied

  
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