allopolyploid


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al·lo·pol·y·ploid

(al'ō-pol'i-ployd),
An alloploid having three or more haploid sets of chromosomes.
[allo- + polyploid]

allopolyploid

(ăl′ə-pŏl′ē-ploid′)
adj.
Having two or more complete sets of chromosomes derived from different species.
n.
An allopolyploid organism.

al′lo·pol′y·ploi′dy n.

allopolyploid

[al′əpol′iploid]
Etymology: Gk, allos + polyplous, many times, eidos form
1 an individual, an organism, a strain, or a cell that has more than two genetically distinct sets of chromosomes derived from two or more different ancestral species, as occurs in hybridization. Such individuals are referred to as allotriploid, allotetraploid, allopentaploid, allohexaploid, and so on, depending on the number of haploid sets of chromosomes they contain. Compare allodiploid, autodiploid.See also mosaic.
2 also allopolyploidic, pertaining to such an individual, organism, strain, or cell. Also called alloploid. allopolyploidy, autopolyploid, n.

allopolyploid

adjective Referring to allopolyploidy.

noun
(1) A polyploid organism with multiple chromosome sets from different species.
(2) A hybrid organism created from two closely related species, which contains one or more extra sets of chromosomes.

al·lo·pol·y·ploid

(al'ō-pol'i-ployd)
An alloploid having three or more haploid sets of chromosomes.
[allo- + polyploid]
Allopolyploidclick for a larger image
Fig. 24 Allopolyploid . The creation of a fertile allotetraploid.

allopolyploid

a type of POLYPLOID in which the number of chromosomes is doubled in a hybrid between two species. The resulting allotetraploid or amphidiploid is fertile since HOMOLOGOUS CHROMOSOMES of both types can now pair at MEIOSIS to produce viable GAMETES

Such a process has been important in the production of new species, particularly in plants. For example, the successful marshland grass Spartina anglica is a fertile allotetraploid developed from an infertile hybrid (S. townsendii) produced originally by a cross between S. alterniflora and S. maritima. Compare AUTOPOLYPLOID.

References in periodicals archive ?
These studies support allopolyploid origins of North
DNA sequence data have the potential to infer allopolyploid origins
These studies showed new allopolyploid origins, however, of S.
P genome allopolyploid origins to be characteristic of a much wider
Our data are consistent, however, with an allopolyploid origin of N.
Although we have initiated parallel studies with other low copy genes such as g3pdh and idh, our sampling is not yet sufficient to make inferences from those genes beyond confirming an allopolyploid pattern of variation in Navarretia involucrata.
In the absence of persistent diploid progenitors in the same region as an allopolyploid species, distinguishing the timing of allopolyploidization relative to dispersal is largely left to conjecture if the putative parents themselves co-occur in a common region.
Single direction hybridization and allopolyploidization may produce cytoplasmically uniform hybrids or allopolyploids despite distinct origins (Soltis et al.
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.
The use of patterns in the study of the evolution of allopolyploids.
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.
These species or their ancestors probably originated as allopolyploids, rather than as autopolyploids (Heaslip, 1951).