Understanding Evolution: your one-stop source for information on evolution
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Misconceptions about natural selection and adaptation :

But it’s not random either!

So it is a misconception to view natural selection as a process that perfects organisms. At the opposite extreme, natural selection is sometimes interpreted as a random process. This is also a misconception. The genetic variation that occurs in a population because of mutation is random — but selection acts on that variation in a very non-random way: genetic variants that aid survival and reproduction are much more likely to become common than variants that don't. Natural selection is not random!

A population undergoes random mutation and non-random selection
A population of organisms undergoes random mutation and non-random selection. The result is non-random evolutionary change.

The "bad" gene

Defining adaptation

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Learn more about random mutation or the process of natural selection.