How do mutations introduce new traits?

The flow of individuals in and out of a population introduces new alleles and increases genetic variation within that population.

Explanation:

Explanation:

The ultimate source of all genetic variation is mutation. Mutation is important as the first step of evolution because it creates a new DNA sequence for a particular gene, creating a new allele. Recombination also can create a new DNA sequence (a new allele) for a specific gene through intragenic recombination.