dna mutations wikipedia

Mutations can happen for several reasons. Somatic mutations occur in non-reproductive cells and so wont be passed on to offspring.

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Damage by radiation or by certain chemicals may cause mutations.

. A mutation is a change in DNA the hereditary material of life. A mutation is a change in a DNA sequence. In one common damage event adjacent bases bond with each other instead of across the ladder.

An organisms DNA affects how it looks how it behaves and its physiology. Ultraviolet UV photons harm the DNA molecules of living organisms in different ways. Mutations can result from DNA copying mistakes made during cell division exposure to ionizing radiation exposure to chemicals called mutagens or infection by viruses.

Mutations are essential to evolution. These alterations can be caused by random mistakes in DNA replication or by environmental influences such as UV rays and chemicals. DNA mutations occur when there are changes in the nucleotide sequence that makes up a strand of DNA.

So a change in an organisms DNA can cause changes in all aspects of its life. Photo from Wikipedia by LepoRello under CC BY-SA 30. Selection of notable mutations ordered in a standard table of the genetic code of amino acids.

This makes a bulge and the distorted DNA molecule does not function properly. Since all cells in our body contain DNA there are lots of places for mutations to occur. It can happen because of errors when meiosis produces the gametes.

This means changes to the DNA or to the chromosomes which carry the DNA. DNA UV mutationsvg. In biology a mutation is a change in the genetic material.

These changes are heritable unless they have lethal effects. For example the yellow color on half of a petal. However not all mutations matter for evolution.

Without mutation evolution could not occur. As can be seen clinically important missense mutations generally change the properties of the coded amino acid residue between being basic acidic polar or nonpolar while nonsense mutations result in a stop codon. They are the raw material of genetic variation.

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