The insertion and deletion are types of DNA mutations. Insertion involves addition of one or more base pairs of nucleotide into a gene. During gene expression the information carried in the gene is converted into protein. In case of insertion mutation, the size of the protein formed is bigger than the protein formed by the normal gene. Contrary, deletion is type gene mutation where the one or more base pairs of nucleotide are removed from the gene. As a result, the size of the protein synthesized from the resulting gene will be smaller than that of the normal gene. In both cases the resulting proteins might lose their normal functions.