Most mutations do not become widespread in a population because they lower an individual's fitness. True or False?

Answer: True

Explanation:

Most of the mutation is not widespread because they cannot be transferred from one generation to another and moreover due to this reason they are not naturally selected.

These mutations makes the body of individual weaker and leads to the death of the organism.

If the organism dies how will it transfer the traits so is not favored by nature. This is against the fitness of the individual and the organism becomes weak.