On 9/2/2012 12:36 PM, Craig Weinberg wrote:
On Sunday, September 2, 2012 3:28:26 PM UTC-4, Brent wrote: On 9/2/2012 9:09 AM, John Clark wrote: > 6) Evolution has no foresight: This is the most important reason of all. > A jet engine works better than a prop engine in an airplane. I give you a > prop engine and tell you to turn it into a jet, but you must do it while > the engine is running, you must do it in one million small steps, and you > must do it so every one of those small steps immediately improves > the operation > of the engine. Eventually you would get an improved engine of some > sort, but it > wouldn't look anything like a jet. Good exposition. But it's not the case every small step must be an improvement. It's sufficient that it not be a degradation. It seems like both of you are attributing to evolution some kind of universal fitness.
Not at all. In fact John was, in part, explaining why evolution often comes up with poor designs - because it's constrained by evolving what already exists and it can't go thru intermediate designs that are inferior at reproducing.
The terms improvement and degradation superimpose a pseudo-teleology on evolution.
No they are just relative to reproductive fitness.
In reality, if your island is suddenly underwater, whoever happens to have the leftover semi-gills stands a better chance of surviving and reproducing than the otherwise superior other species. It has nothing to do with improvement, it's just an accumulation of environmental shakeouts. Survival of the lucky.
That's the natural selection. The other part is the random variation. Brent "And to think of this great country in danger of being dominated by people ignorant enough to take a few ancient Babylonian legends as the canons of modern culture. Our scientific men are paying for their failure to speak out earlier. There is no use now talking evolution to these people. Their ears are stuffed with Genesis." --- Luther Burbank, on the Scopes trial -- You received this message because you are subscribed to the Google Groups "Everything List" group. To post to this group, send email to email@example.com. To unsubscribe from this group, send email to everything-list+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/everything-list?hl=en.