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Line 27: − − Darwin himself even noted the difficulty of the eye: {{Cquote|To suppose that the eye with all its inimitable contrivances for adjusting the focus to different distances, for admitting different amounts of light, and for the correction of spherical and chromatic aberration, could have been formed by natural selection, seems, I freely confess, absurd in the highest degree. - Charles Darwin, ''Origin of Species''}}
Irreducible complexity (view source)
Revision as of 21:17, December 24, 2008
, 21:17, December 24, 2008rvv: "Citing his statement at face value is subtly out of context." - Answers in Genesis. Maybe flesh out the argument, but the quote alone simply makes us an easy target for the critics.
[[Image:Wm Dembski.jpg|right|150px|thumb|[[William Dembski]]]]
[[Image:Wm Dembski.jpg|right|150px|thumb|[[William Dembski]]]]
[[William Dembski]] in his book ''No Free Lunch'', states the the following:
[[William Dembski]] in his book ''No Free Lunch'', states the the following:
"A system performing a given basic function is irreducibly complex if it includes a set of well-matched, mutually interacting, non-arbitrarily individuated parts such that each part in the set is indispensable to maintaining the system's basic, and therefore original, function. The set of these indispensable parts is known as the irreducible core of the system. <ref>William Dembski, ''No Free Lunch'',(2001), p. 285. ISBN 0742512975</ref>
"A system performing a given basic function is irreducibly complex if it includes a set of well-matched, mutually interacting, non-arbitrarily individuated parts such that each part in the set is indispensable to maintaining the system's basic, and therefore original, function. The set of these indispensable parts is known as the irreducible core of the system. <ref>William Dembski, ''No Free Lunch'',(2001), p. 285. ISBN 0742512975</ref>
The most commonly used examples of irreducibly complex biological systems are the human compound eye, the [[blood clotting cascade]], and the bacterial [[flagellum]]. However, not all parts of the blood clotting cascade are necessary, as one Behe lists is missing in whales, and different animals have different numbers of clotting steps. The evolution of the compound eye is now well understood, and it has been found that the basal body of the flagellum
The most commonly used examples of irreducibly complex biological systems are the human compound eye, the [[blood clotting cascade]], and the bacterial [[flagellum]]. However, not all parts of the blood clotting cascade are necessary, as one Behe lists is missing in whales, and different animals have different numbers of clotting steps. The evolution of the compound eye is now well understood, and it has been found that the basal body of the flagellum
is similar to a needle-like structure some bacteria use to inject toxins into eukaryotic cells.
is similar to a needle-like structure some bacteria use to inject toxins into eukaryotic cells.
Kenneth R. Miller describes hypothetical precursors to the flagellum's being used as ionic channels within [[bacteria]], known as the ''Type III Secretory System''.<ref>[http://www.millerandlevine.com/km/evol/design2/article.html The Flagellum Unspun]</ref> However, Professor Behe counters that Miller's criticism of his work is flawed. <ref>http://www.arn.org/docs/behe/mb_trueacidtest.htm</ref> Critics, including biology professor John McDonald, have countered Behe's toy model, the mouse trap, used to illustrate the concept. McDonald produced examples of how he considered the mousetrap to be "easy to reduce", eventually to a single part.<ref name=trap>[http://udel.edu/~mcdonald/mousetrap.html A reducibly complex mousetrap] (graphics-intensive, requires [[JavaScript]])</ref> <!--Critics consider that most, or all, of the examples were based on misunderstandings of the workings of the biological systems in question, and consider the low quality of these examples excellent evidence for the argument from ignorance.-->However, Professor Behe disputes the criticism of John McDonald. <ref>http://www.arn.org/docs/behe/mb_mousetrapdefended.htm</ref>
Kenneth R. Miller describes hypothetical precursors to the flagellum's being used as ionic channels within [[bacteria]], known as the ''Type III Secretory System''.<ref>[http://www.millerandlevine.com/km/evol/design2/article.html The Flagellum Unspun]</ref> However, Professor Behe counters that Miller's criticism of his work is flawed. <ref>http://www.arn.org/docs/behe/mb_trueacidtest.htm</ref> Critics, including biology professor John McDonald, have countered Behe's toy model, the mouse trap, used to illustrate the concept. McDonald produced examples of how he considered the mousetrap to be "easy to reduce", eventually to a single part.<ref name=trap>[http://udel.edu/~mcdonald/mousetrap.html A reducibly complex mousetrap] (graphics-intensive, requires [[JavaScript]])</ref> <!--Critics consider that most, or all, of the examples were based on misunderstandings of the workings of the biological systems in question, and consider the low quality of these examples excellent evidence for the argument from ignorance.-->However, Professor Behe disputes the criticism of John McDonald. <ref>http://www.arn.org/docs/behe/mb_mousetrapdefended.htm</ref>