One characteristic of the DNA molecule is its replication capability. What are the consequences of failures during DNA replication?
Ideally a DNA molecule should replicate in a perfect way. Sometimes however failures in the duplication occur, with alteration (deletion, addition or substitution) of one or more nucleotides in the molecule.
Those mistakes, or mutations, thus make changes in the protein synthesis process too. For instance, the production of an important protein for cells or tissues may be suppressed, new utile or inutile proteins can be formed, etc. The mistake in the DNA duplication and the resulting production of changed genetic material are some of the main creative forces for the biological evolution and the diversity of species.