polyploidy

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Related to Allopolyploids: amphidiploid, autopolyploid

pol·y·ploid

(pŏl′ē-ploid′)

adj.

Having one or more extra sets of chromosomes: a polyploid species; a polyploid cell.

An organism with more than two sets of chromosomes.

pol′y·ploi′dy n.

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Noun

polyploidy - the condition of being polyploid

condition - a mode of being or form of existence of a person or thing; "the human condition"

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References in periodicals archive ?

However, as the spore characters can also be variable, especially in cases where there are events of hybridization and polyploidy, the recognition of primary diploid species, interspecific hybrids, and allopolyploids can provide further information on the genus diversity, as well as on the processes of evolution that have been contributing to its diversification (Taylor et al.

Studies on chromosome numbers and spore size in Brazilian Isoetes

mostly allopolyploids as discussed below in "Polyploidy--DNA

Systematics, diversity, genetics, and evolution of wild and cultivated potatoes

Discussing in turn the genomics of hybrids and of polyploids, and mechanisms for novelty in the two, they consider such topics as transcriptome profiling of Drosophila inter-specific hybrids, developments in the study of the genomics and heterosis in hybrid rice, chromosomal and gene expression changes in Brassica allopolyploids, polyploid species-specific chromosomal polymorphisms in wheat, seed development in interploidy hybrids, and genetic and epigenetic mechanisms for polyploidy and hybridity.

Polyploid and hybrid genomics

Stebbins (1942, 1947) early championed the value of allopolyploids in understanding plant biogeography.

Allotetraploids in patagonia with affinities to western North American diploids: did dispersal or genome doubling occur first?

Accessing the parentage of hybrids or allopolyploids is essential for understanding relationships within taxonomically complex groups.

Molecular evidence for genetic heterogeneity and the hybrid origin of Acrorumohra subreflexipinna from Taiwan

In contrast, the absence of multivalents in allopolyploids makes the hybrids less sterile and more competitive (Briggs & Walters, 1984); this increases their dispersal and their chances of being established as a new species.

Geographical variation and successive adaptive radiations of yellow-flowered Teucrium (Labiatae) in the mediterranean region

However, when Kimber discusses the relationships of allopolyploids in general (1986: 65), his comments are ad hoc and not based on observations: "It can be demonstrated that chromosome pairing in hybrids represents the comparison of some DNA distributed along the entire length of the nuclear DNA, and thus it should represent the most reliable method of determining genomic homology in allopolyploids.