Let me explain... A friend and I read some articles, part of a Biology book, and watched a video on evolution. We then tried to explain what Evolution is to each other.

My friend said that Natural Selection is a mechanism inside the organism that mutates the DNA to make its offspring survive in an environment; that natural selection mutates the DNA beneficially and that random mutations are not useful (like blue eyes). But I disagree and think that it is closer to Lamarkian theory.

I told him that DNA from male and female recombines and randomly mutates making a new "recipe" for the offspring (adding a new characteristic(s)). If the offspring is well suited for the environment, then it survives and passes on its characteristics to its offspring. If it does not have fitness for its environment, it dies. So, Natural Selection is were nature "selects" who survives and reproduces a lot.

So is the DNA mutation process random or is mutation directed to make an organism that is suited to survive its environment?

None of my friends are a Biology student, so I can't ask then which explanation is correct (or at least more valid).

I'd prefer you dont answer: "None of these explanations are correct," but to say which one is more valid and correct misconceptions or add more that is missing (of course these are only summaries of our discussion). But of course you can answer that neither of our explanations are correct...