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Old 09-20-2007, 05:25 PM   #12
PZ Myers
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Quote:
Happywarrior wrote
Can you address the probability problem of the formation of the building blocks for cells. Because of the complexity of cell structure I have heard the it would be 1:125 million, million million million etc. that chance could bring the right sequences of amino acids together to create the 25 protiens needed we have today. Is this just chance or how do you account for the existance of such complex structures?
You probably expect me to take such garbage seriously, don't you?

OK, that's a collection of errors. One is that it presumes that the probability of a complex outcome is the product of a series of dependent probabilities. It is not. Every poker hand dealt has had exactly the same probability, whether it's a royal flush or a garbage hand.

Another problem is the belief that there is only one possible outcome, and that we have to calculate the possibility of a single specific instance. There are lots of sequences, for instance, that function as an ATPase; we can see that by looking at a variety of different organisms and cataloging the variety present. We don't even know how many possible sequences will work for any particular function.

And finally, evolution doesn't demand the perfect sequence that carries out an absolutely optimal function. All that is required for selection to function is a relatively better sequence. Especially at the beginning of the appearance of life on earth, before the competition got fierce, the constraints would have been quite lax.
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