polyploidy

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Related to Allopolyploids: amphidiploid, autopolyploid

polyploidy

 [pol´e-ploi″de]
the state of having more than two sets of homologous chromosomes.

pol·y·ploi·dy

(pol'ē-ploy'dē),
The state of a cell nucleus containing three or more haploid sets. Cells containing three, four, five, or six multiples are referred to, respectively, as triploid, tetraploid, pentaploid, or hexaploid.
[poly- + G. ploidēs, in form]

pol·y·ploi·dy

(pol'ē-ploy'dē)
The state of a cell nucleus containing three or more haploid sets. Cells containing three, four, five, or six multiples are referred to, respectively, as triploid, tetraploid, pentaploid, and hexaploid.
[poly- + G. ploidēs, in form]
References in periodicals archive ?
Clear evidence is provided by GISH about allopolyploid evolutionary origin of Camellia reticulata.
considered as strict allopolyploids based on their regular bivalent
Based on the coassembly of homoeologs, SNiPloid compares either putative SNPs detected from an allopolyploid to those obtained in its parental genomes, or putative SNPs derived from two allopolyploid accessions to search for polymorphism.
Grant-Downton and Dickinson (2006) indicated that research of the epigenetics of allopolyploid hybrids between Arabidopsis thaliana and A.
While our study is not the first to distinguish the timing of allopolyploidization relative to dispersal, it contributes to a growing body of evidence documenting the post dispersal formation of allopolyploids in diverse lineages, including well studied examples such as Tragapogon (e.g., Ownbey, 1950; Lim et al., 2008; dispersal in the past century) and Lepidium (Mummenhoff et al., 2004; Dierschke et al., 2009; dispersal also during the Pliestocene).
adiantum-nigrum is of allopolyploid origin, arising from the hybridization of two strictly European diploids, A.
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." Presently, objective similarity between chromosomes exists only at the macroscopic level.
Asexual dandelions reproduce by nonpseudogamous gametophytic parthenogenesis (Gustafsson, 1946) and are presumably allopolyploids (Richards, 1986).
were considered to be allopolyploids having some ancestral genomes in common.
These species or their ancestors probably originated as allopolyploids, rather than as autopolyploids (Heaslip, 1951).
Genomic in situ hybridization (GISH) technique has been used to distinguish different genomes in allopolyploids and alien addition lines (Anamthawat-Jonssen et al., 1990; Mukai et al., 1993; Chen et al., 1995).