mutation

Mutation is a change in gene sequence. A mutation contains as small a change as a single DNA building block or a nucleotide base replacing another nucleotide base. At the same time, larger mutations affect many genes on the chromosome. In addition to substitution, the mutation can also be caused by insertion, deletion or duplication of the DNA sequence.

Several mutations are hereditary, as it is inherited from descendants through the germ line from the parent having the mutation to carry the mutant eggs or sperm cells. Non-genetic mutations also exist in non-germline cells known as somatic mutations. Mutagenesis is a chemical and environmental factor that can introduce mutations such as ultraviolet light into DNA sequences due to errors in DNA replication or the introduction of mutations by exposure to mutagens. Some mutations result in no change in the amino acid sequence of the encoded protein and can be described as silent mutations. Other mutations result in abnormal protein products. Mutations can introduce new alleles into the biological population and increase the genetic variation of the population

Mutations can be categorized into two broad categories based on their position: somatic mutation and germline mutation. Somatic mutations occur in non-germ cells. Since genetically normal somatic cells can compensate for mutant cells, many somatic mutations do not significantly affect organisms. However, some other mutations have a major impact on the life and function of organisms. For example, somatic mutations affecting cell division, especially those which allow cells to undergo an uncontrolled division, are the basis of many forms of cancer.

Mutations that occur in somatic cells that are not inherited by offspring are somatic mutations. Mutations that occur in cells that produce gametes or gametes are special because they may affect the next generation and not affect adults at all. This change is known as a germline mutation. Because they occur in the cells (reproductive cells) used for reproductive and give the opportunity to change more with time. If a mutation has a detrimental effect on the offspring phenotype, that mutation is called a genetic disease. Alternatively, if the mutation has a positive effect on the adaptability of the offspring, it is called adaptation. Therefore, all mutations affecting the adaptability of offspring are the driving force of evolution.