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===Junk DNA===
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Junk DNA is DNA that has no biologically relevant function such as pseudogenes and fragments of once active transposons. Bacteria genomes have very little junk DNA<ref>{{
▲Junk DNA is DNA that has no biologically relevant function such as pseudogenes and fragments of once active transposons. Bacteria genomes have very little junk DNA<ref>{{ cite journal | vauthors = Gil R, and Latorre A | date = 2012 | title = Factors behind junk DNA in bacteria | journal = Genes | volume = 3 | pages = 634-650 | doi = 10.3390/genes3040634 }}</ref> but some eukaryotic genomes may have a substantial amount of junk DNA.<ref name="PalazzoGregory2014">{{cite journal | vauthors = Palazzo AF, Gregory TR | title = The case for junk DNA | journal = PLoS Genetics | volume = 10 | issue = 5 | pages = e1004351 | date = May 2014 | pmid = 24809441 | pmc = 4014423 | doi = 10.1371/journal.pgen.1004351 }}</ref> The exact amount of nonfunctional DNA in humans and other species with large genomes has not been determined and there is considerable controversy in the scientific literature.<ref>{{ cite journal | last = Morange | first = Michel | date = 2014 | title = Genome as a Multipurpose Structure Built by Evolution | journal = Perspectives in Biology and Medicine | volume = 57 | pages = 162-171 | doi = 10.1353/pbm.2014.0008 }}</ref><ref>{{cite journal | vauthors = Haerty W, and Ponting CP | title = No Gene in the Genome Makes Sense Except in the Light of Evolution. | year = 2014 | journal = Annual Review of Genomics and Human Genetics | volume =25 | pages = 71-92 | doi = 10.1146/annurev-genom-090413-025621}}</ref> See the article on [[Junk DNA]] for more information.
The nonfunctional DNA in bacterial genomes is mostly located in the intergenic fraction of non-coding DNA but in eukaryotic genomes it may also be found within introns (see [[Introns]]). It's important to note that there are many examples of functional DNA elements in non-coding DNA (see above) and there are no scientists who claim that all non-coding DNA is junk.
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