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allopolyploidadjective Referring to allopolyploidy.
(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.
allopolyploida 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.