Genetic mutation and the variations they produce result in population changes and thus, evolution.
Mutation is the change in the sequence of the DNA, that may or may not produce an effect. These mutations can be deletion, addition, substitution, reversion, etc. Some mutations do not produce any morphological effects, such mutations are called silent mutations.
Evolution is the change in the genotype or phenotype of an organism, that takes generations to happen. These are the changes that are heritable. Evolution is a direction-less and a slow process. The change that begins in the individual of a population may take millions of years to express in the offspring.
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