How is the sea of electrons model is used to explain the physical properties of metals? electrons give off a charge, the greater or lesser the metal will depend on how packed the universe is in the metal, atoms and such.
Mutations can also be caused by exposure to specific chemicals or radiation. These agents cause the DNA to break down. This is not necessarily unnatural  even in the most isolated and pristine environments, DNA breaks down. Nevertheless, when the cell repairs the DNA, it might not do a perfect job of the repair.
Article Summary: Mutations are the changes in the structure of the DNA molecule or the changes in the gene sequences. There are many types of mutations which cause the defect in the genetic information....When the DNA molecule in the cell replicates, several chemical changes occur during this process.f the mutation occurs in the intron region which is also the non coding region of the DNA molecule, then changes occur in the RNA effecting the coding of gene. Sickle cell anemia is caused by the point mutations. Changes occur in the beta hemoglobin.