Answer and Explanation:
Gene mutation involves a change in the structure of a gene. a gene mutation arises as a result of a change in the chemical nature of the gene.Gene mutation include deletion and inversion.
Deletion is the removal of a gene portion. if the base thymine is deleted from its position at the section of the DNA, the base sequence becomes altered at this point.
Inversion occurs when a portion of a DNA strand breaks at two points, the middle piece detaches and rotates 180 and then rejoins with the base sequences inverted.