Answer:
Mutations occur spontaneously in all living things. By changing the chemistry of the organism's genetic material or altering the structure of a chromosome a mutation changes die structure or function of the organism and its offspring. Most often the mutation is harmful, and the change is erased by natural selection.
A central tenet in evolutionary theory is that mutations occur randomly with respect to their value to an organism; selection then governs whether they are fixed in a population.
Factors in the environment are thought to influence the rate of mutation but are not generally thought to influence the direction of mutation. ... In this respect, mutations are random — whether a particular mutation happens or not is generally unrelated to how useful that mutation would be.
Explanation:
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