Question about Evolution

[Gawdzilla Sama]

Mutation is the raw material, natural selection acts upon mutation.

Suppose a fish is hatched with a mutation that provides ever-so-slightly better oxygen extraction.  The mutation itself is thoroughly random, but it provides a benefit that may make that particular fish better able to adapt and to breed than some of its cousins.  Since mutations occur at the genetic level, this new trait will be passed on to some of the mutated fish's young.  The fish that inherit this trait will be 'fitter' and more likely to survive and breed.  The mutation (random) has thus been selected for (non-random).

Good question.

Boru

Good explanation, except for the "ever-so-slightly" part. Such a mutation would likely be lost in the shuffle.

There are very few "bold strokes" known in evolution. "Small changes, Ellie, small changes."