Explanation:
It can be the results of evolutionary advantage
It can be the result of an evolutionary disadvantage
It can be the result of no effect of phenotype
Or it may be the result of all of these mentions above.
Genetic mutation is the permanent alteration in the DNA sequence that makes up the gene. Mutation vary in size, they can affect from anywhere from a single strands of DNA building block to a large segment of the chromosomes that includes multiple genes.