Admin: 1 версия импортирована

2025-11-13T17:59:51Z

1 версия импортирована

← Предыдущая версия		Версия от 17:59, 13 ноября 2025
(нет различий)

ru>MerielGJones: Importing Wikidata short description: "Group of interrelated and interbreeding species that also have differing levels of ploidy"

2025-06-15T09:47:59Z

Importing Wikidata short description: "Group of interrelated and interbreeding species that also have differing levels of ploidy"

Новая страница

{{Short description|Group of interrelated and interbreeding species that also have differing levels of ploidy}}
A '''polyploid complex''', also called a '''diploid-polyploid complex''', is a group of interrelated and interbreeding species that also have differing levels of [[ploidy]] that can allow [[interbreeding]].

A [[polyploid]] complex was described by [[E. B. Babcock]] and [[G. Ledyard Stebbins]] in their 1938 monograph ''The American Species of ''Crepis'': their interrelationships and distribution as affected by polyploidy and apomixis''. In ''[[Crepis]]'' and some other perennial plant species, a polyploid complex may arise where there are at least two genetically isolated diploid populations, in addition to auto- and allopolyploid derivatives that coexist and interbreed. Thus a complex network of interrelated forms may exist where the polyploid forms allow for intermediate forms between the diploid species that are otherwise unable to interbreed.<ref>{{citation |author=Stebbins, G.L. Jr. |year=1940 |title=The Significance of Polyploidy in Plant Evolution |journal=The American Naturalist |volume=74 |issue=750 |pages=54–66 |jstor=2457323 |doi= 10.1086/280872|bibcode=1940ANat...74...54S |s2cid=86709379 }}</ref>

This complex situation does not fit well within the [[biological species concept]] of [[Ernst Mayr]] which defines a species as "groups of actually or potentially interbreeding natural populations which are reproductively isolated from other such groups".

In many diploid-polyploid complexes the polyploid hybrid members reproduce [[asexual reproduction|asexually]] while diploids reproduce sexually.<ref name=Horandl>{{citation |author1=Elvira Hörandl |author2=Anne-Caroline Cosendai |author3=Eva Maria Temsch |year=2008 |title=Understanding the geographic distributions of apomictic plants: a case for a pluralistic approach |journal=Plant Ecology & Diversity |volume=1|issue=2 |pages=309–320 |doi=10.1080/17550870802351175|pmc=2950697 |pmid=20936092}}</ref> Thus polyploidy is related to the phenomenon called "geographic parthenogenesis" by zoologist [[Albert Vandel]],<ref>{{citation |author=Vandel, A. |year=1928 |title=La parthénogenèse géographique: Contribution à l'étude biologique et cytologique de la parthénogenèse naturelle. I |journal=Bulletin Biologique de la France et de la Belgique |volume=62 |pages=164–281}}</ref> that asexual organisms often have greater geographic ranges than their sexual relatives. It is not known which of the associated factors is the major determiner of geographic parthenogenesis, [[hybrid (biology)|hybridization]], polyploidy, or asexual reproduction.<ref name=Horandl/>

==See also==
* [[Species complex]]

==References==
<references/>

[[Category:Genetics]]
[[Category:Evolutionary biology]]

Polyploid complex - История изменений

Admin: 1 версия импортирована

ru>MerielGJones: Importing Wikidata short description: "Group of interrelated and interbreeding species that also have differing levels of ploidy"