Editing Karyotype (section)

=== Chromosomal polymorphism ===

Some species are [[Polymorphism (biology)|polymorphic]] for different chromosome structural forms.<ref>{{cite book |author1=Rieger, R. |author2=Michaelis, A. |author3=Green, M.M. |year=1968  |title=A glossary of genetics and cytogenetics: Classical and molecular |url=https://archive.org/details/glossaryofgeneti00rieg |url-access=registration |publisher=Springer-Verlag |location=New York |isbn=9780387076683 }}</ref> The structural variation may be associated with different numbers of chromosomes in different individuals, which occurs in the ladybird beetle ''[[Chilocorus stigma]]'', some [[mantids]] of the genus ''[[Ameles]]'',<ref>{{cite journal |last1=Gustavsson |first1=Ingemar |date=3 March 1969 |title= Cytogenetics, distribution and phenotypic effects of a translocation in Swedish cattle.|url= |journal=Hereditas |volume=63 |issue= 1–2|pages=68–169 |doi= 10.1111/j.1601-5223.1969.tb02259.x|pmid=5399228 |access-date=}}</ref> the European shrew ''[[Sorex araneus]]''.<ref>{{Cite journal|last=Searle|first=J. B.|date=1984-06-01|title=Three New Karyotypic Races of the Common Shrew Sorex Araneus (Mammalia: Insectivora) and a Phylogeny|journal=Systematic Biology|volume=33|issue=2|pages=184–194|doi=10.1093/sysbio/33.2.184|issn=1063-5157}}</ref> There is some evidence from the case of the [[mollusc]] ''[[Thais lapillus]]'' (the [[dog whelk]]) on the [[Brittany]] coast, that the two chromosome morphs are [[Adaptation|adapted]] to different habitats.<ref>{{harvnb|White|1973|p=169}}</ref>