Question

How can a mutation lead to evolution?

Answer 1

If a mutation results in a trait that will increase the likelihood that the individual having the mutation will survive, mate, and produce offspring that have the same mutation, then that population will evolve. As more and more members of the population having the mutation reproduce and pass on the mutation to more and more members of the population, the allele frequency for that trait will change, and that population will have undergone evolution.