A Mutation occurs when a DNA gene is damaged or changed in such a way as to alter the genetic message carried by that gene. A Mutagen is an agent of substance that can bring about a permanent alteration to the physical composition of a DNA gene such that the genetic message is changed.
1 A statement that is completely unbiased is objective whereas a statement that is characterized by the thoughts and the views of the speaker is subjective.  Objective is not characterized by any previous experience of the speaker whereas subjective is certainly characterized by the previous experiences of the speaker.
subjectively - in a subjective way; you cannot look at these facts subjectively objectively - with objectivity; we must look at the facts objectively Translations