You have a good topic. However, it does not present the problem for evolution that you think it poses. It is pretty well understood that the DNA is not a blueprint for the organism, but is more of a blueprint for a set of development processes out of which the organism arises.
The real implication of this is that environment plays a substantial role in forming an organism, and that DNA is only part of the story. The importance of environment has long been recognized.
nwr is correct, to some extent. However, DNA is the instructions to create life. Environment does play a part to some extent, but CODE is required for all complexities in life. You could not park your pickup in a certain environment, and given enough time, the environment would fix the transmission. This is foolish. DNA contains the set of instructions for forming, developing, and repairing the human anatomy.
Now DNA is more complex than just a set of instructions. Think of DNA as a phone book, carrying information required to complete specific task (not calling people, but you get the relationship I hope). Suppose your body requires information. There are two ways to retrieve this. One is to tear out the page of information required, and use it. The problem is, the information is no longer stored in the biological phonebook I speak of. The other way is to COPY the information, and use the duplicate to complete the task. This is what the human body does.
When specific information is required, the double-helix unwinds, and breaks in half. Cytozene, Guanine, Thymine, and Adonine fit into each of the halves, and the duplicate (mRNA) is used. The original completes, and winds back up (much like a zipper on jeans). On a side note, it`s interesting to know that the hydrogen bonds that hold DNA together are incredibly weak, and the double-helix form actually serves a much needed purpose, to strengthen it.
The duplicate is read until it reaches a stop, and the molecule encoded is produced.
None of the above described has anything to do with environment.
Now again, nwr is correct, environment does play a part in development. The body sends signals to the brain, and the brain neurons determine the correct course of action. But DNA is the one and only source of genetic information. If I had to give numbers, I would say DNA is 99% responsible for any organisms physical state, and 70-80% responsible for ones mental state. The reason for this is outside influence has a much larger effect on mental state (witnessing a murder, loss of a loved one, rape, etc.). But since DNA is responsible for the development of the brain, since fertilization, it would affect how the brain would react to any given environmental circumstances. Each human reacts to differently to similar environmental circumstances because of genetic differences.
Dennis.
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