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<p><b>Новая страница</b></p><div>{{Short description|Genetic segments that confer no benefit}}<br />
'''Parasitic chromosomes''' are "[[Selfish genetic element|selfish]]" [[chromosomes]] that propagate throughout cell divisions, even if they confer no benefit to the overall organism's survival. Parasitic chromosomes can persist even if slightly detrimental to survival, as is characteristic of some selfish genetic elements. Parasitic chromosomes are often [[B chromosome]]s, such that they are not necessarily present in the majority of the species population and are not needed for basic life functions, in contrast to [[A chromosome]]s. Parasitic chromosomes are classified as [[Selfish DNA|selfish genetic elements]].<ref name=":0">{{Cite journal|last1=Werren|first1=J. H.|last2=Beukeboom|first2=L. W.|date=1993-08-01|title=Population genetics of a parasitic chromosome: theoretical analysis of PSR in subdivided populations|journal=The American Naturalist|volume=142|issue=2|pages=224–241|doi=10.1086/285536|issn=0003-0147|pmid=19425977|s2cid=16816245|url=https://www.rug.nl/research/portal/files/3303361/1993AmNatWerren.pdf}}</ref><br />
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Parasitic chromosomes, if detrimental to an organism's survival, often are selected against by [[natural selection]] over time, but if the chromosome is able to act like a selfish DNA element, it can spread throughout a population. An example of a parasitic chromosome is the b24 chromosome in [[grasshoppers]].<ref name=":0" /><ref>{{Cite journal|last1=Manrique-Poyato|first1=María Inmaculada|last2=López-León|first2=María Dolores|last3=Cabrero|first3=Josefa|last4=Perfectti|first4=Francisco|last5=Camacho|first5=Juan Pedro M.|date=2013-12-26|title=Spread of a New Parasitic B Chromosome Variant Is Facilitated by High Gene Flow|journal=PLOS ONE|volume=8|issue=12|article-number=e83712|doi=10.1371/journal.pone.0083712|issn=1932-6203|pmc=3873393|pmid=24386259|bibcode=2013PLoSO...883712M|doi-access=free}}</ref><br />
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== References ==<br />
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[[Category:Genetics]]<br />
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