A few of us were recently discussing why exactly random mutations can't lead to complex features of organisms, like the gears on that jumping insect, and what are the limits of Darwinian evolution, specifically of random mutations...
More than a few of us! ;) The discussion we had was at our monthly meet-up for FOTCM members in the North Carolina area. It was quite the discussion, too! Behe was really just the launching point for the wide variety of topics that came up (we'd recently watched the documentary Third Eye Spies on the history of the U.S.'s remote viewing programs, so psi came up too, as well as some of the cosmology stuff discussed on the afterlife thread).
One of the other questions that came up and which we discussed had to do with the nature of DNA as a language. Here's the gist: DNA is largely arbitrary, like any code. There's nothing intrinsic about the structure of DNA that codes for proteins. Perhaps theoretically it's possible to have a slightly differently composed DNA structure that could also code for proteins. But the thing about proteins themselves is that
there doesn't seem to be anything arbitrary about them. Specific sequences of amino acids are required in order for the protein to fold into a particular shape. And only some of those folded shapes will perform any actual function in an organism.
This is very similar to the structure of human-created languages. First, there is the element of arbitrariness: you can use any sounds or letters as the basis for your language. But the meanings (functions) are necessarily linked to reality: the things of our experience, like objects, actions, thoughts, etc. And proteins are very much like words. For instance, take five-letter words. There are 26^5 possible combinations of letters to be made in English. But only a fraction of those are words, just like only a fraction of amino-acid sequences will form actual proteins.
And just like with proteins, the majority of 'mutations' to words will harm their function. But even then, they have a degree of redundancy. Take the five-letter word 'first'. Even if you change it to 'forst', you still might be able to grasp the meaning of 'first' if it's used in context. Maybe it's a foreign person trying to write it or say it. So if they say, "I want to do this forst, and that second", it's at least intelligible. Like a protein, it suffered a degradative mutation, but it still gets the job done, just not as well. Same goes for typos. You can usually recognize a typo as a typo and grasp the intended meaning. So the misspelled word still serves the correct function, just not as well as the word in its pure form.
Longer words have even more redundancy (keep in mind that proteins can be hundreds or even thousands of 'letters' long). Take the word "antiestablishmentarianism". Make a single point mutation, and just like first/forst, the word is still readable: "antiestablushmentarianism". But change just 4 letters and it becomes practically unreadable: "untixstablisymentariacism." Same goes for genes: most point mutations are neutral or damaging, and multiple point mutations make the protein completely worthless.
But what about beneficial mutations? Words have them too. Change the final letter from 'm' to 't' and you have a new word with a new function: antiestablishmentarianist. Such mutations follow certain grammatical rules, in this case having to do with word endings, or suffixes. Just as in proteins, they won't work just anywhere - only in specific places.
You can visualize this 'possibility space' (the collection of all possible sequences) as a big circle. Within this circle is a small circle of only those possibilities that can perform a function (even if they can't do it very well, like 'forst'). And within that circle you will have points representing the 'purest' forms of words (or proteins). In the case of 'antiestablishmentarianism', there may only be 2 fully functional words represented as 2 points. (You could also represent this as mountain peaks on a graph, like Doug Axe does in his book
Undeniable - the mountains represent the family of related words/proteins, and the peaks represent the most functional individual words/proteins within the family.)
Random mutation can move a word from its pure form to various possible degraded forms easily. That's what Behe shows for proteins in his new book. But it's also possible (just not as likely) to move to a new word with a new function randomly - as long as the word is in the same 'family', as in the case of the '-ism' to '-ist' above. The problem is that it's impossible to wander from one family to another randomly. You can't degrade 'antiestablishmentarianism' letter by letter until you get 'psychophysicotherapeutics'.
One way to visualize this is to imagine these words and their variations as two small circles, like we did above, with each point representing a version of the word that is one letter different than the one next to it. Now imagine these circles with are randomly placed on a very large globe the size of the earth. What are the chances of randomly wandering from one circle to the other? It's impossible for all intents and purposes. (The sizes and distances are just a guess - I didn't do the calculations necessary, but it gets across the idea - Axe actually did the calculations for a related example in his book, so read that for a mathematically correct example!)
The problem with that Darwinists is that they assume that it MUST be possible to get from 'antiestablishmentarianism' to 'psychophysicotherapeutics', and to all other words. But that would only be possible if the majority of protein sequences (unlike words) were functional. They have to assume that there are way more functional proteins than there actually are, as if you could just change 3 letters in a large word and get a new word. Change a different 2 letters and you get a completely different word, etc. But that's not the way it works. Functional protein sequences are RARE, just like words are.
Anyways, that discussion led to the observation that the 'language' of proteins seems to be somehow intrinsic in nature. Because of the nature of the molecules that make up the proteins, there are certain possibilities for form and function which we observe as life-forms: body plans of various types, different kinds of tissues, organs, cells, etc. Whatever intelligence 'created' DNA, they did not create those possibilities - they merely utilized or discovered them. The possibilities were already inherent in the properties of the elements. But here's another kicker: they can only be expressed or actualized through the use of an arbitrary code like DNA! What does THAT imply about the nature of the universe?! We have to wrestle not only with the question of who created the DNA language, but also with the question of who created the protein language.
But it goes somewhat deeper. Intelligent Design people also talk about the fine tuning of the cosmos, and how it gives the appearance of design - various physical constants that must be their precise values, in combination with other precise values, otherwise the universe basically falls apart. Well, the periodic table of elements must also be 'fine tuned' to some degree, in order to make amino acids and their combination into proteins possible. It's not just a given that any variation on the periodic table will be able to produce specific macromolecules with higher functions. Basically, it appears as if from the very bottom up, the universe is designed for the possibility of life. But between the level of inorganic matter and organic matter, there must be an infusion of information and intelligence to bridge the gap. From the perspective of chemistry left to its own devices, life is po
ssible. But intelligence is a necessary condition to actually bring it about.