So basically evolution is random. No. The MUTATIONS are random.
They are errors in the copying process. An insertion here,
deletion there, a substitution over yonder; that sort of thing.
Remember that DNA is coding for something. Whether it be protein
synthesis (around 5%) or something more like gene regulation
(much greater %) A simple analogy is to think of DNA and it's
A-C-G-T stuff like a line of text. You start out with a
sentence... I will not work today. Then you add a letter in
someplace (say... the letter 'r' between the 'o' and the 't' of
'not) and see what happens, making sure to keep the same
structure of 1 letter, 4 letters, 3 letters, 4 letters 5
letters. This is what you get. I will nor twor ktoda. This is
catastrophic failure and may result in big ass problems for the
organism depending on where it happens. Now lets try taking a
letter out and see what happens. Let's take the 'r' out of the
word 'work'. I will not wokt oday. Less damage, but still not so
great. May be good or bad for the organ