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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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Noun1.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 ?
The induction of polyploidy in bivalve molluscs is mainly performed by chemical means (Piferrer et al.
FISH studies revealed multiple signals with BCR probe (chromosome 22) and centromeric probes for chromosomes 2 and 18 suggesting polyploidy.
If polyploidy allowed many plant lineages to survive and adapt during global changes, as suggested, we might wonder whether polyploidy will confer a similar advantage in the current period of global warming and general ecological pressure caused by the human race.
Polyploids are organisms with more than two sets of chromosomes (Levin, 2002), and though polyploidy is relatively rare in most groups of animals (Otto and Whitton, 2000; Mable, 2004; but see Legatt and Iwama, 2003), it is extremely common in flowering plants.
We treated the SSR markers as dominant markers in DNAMAN software because in high polyploidy genomes like that of sugarcane, it was difficult to distinguish between the alleles of homologous chromosomes as being heterozygous at particular locus (Oliveira et al.
In various studies on induced polyploidy, the regeneration of mixoploid plants has been reported as a major problem, since the genetic stability of these partial polyploids is unknown.
It is a poisonous alkaloid that is widely used for polyploidy induction (Ade and Rai, 2010).
Twenty-five cells have to be scored, and we define a FISH-positive result as (1) the presence of at least 4 cells with gains in at least 2 centromeric probes or (2) the presence of a homozygous or heterozygous deletion of 9p21 in at least 12 cells or (3) the presence of more than 10 cells with a balanced polyploidy (ie, 4N or 8N).
Polyploidy is common in flowering plants of cold climates with harsh and stressful environments (Meng et al.
Polyploidy and inter-species hybridization occur naturally but can also be artificially induced.
Astyanax have presented an extensive diversity in the chromosome number and karyotype formula, both intra- and interspecifically, besides the occurrence of B chromosomes and natural polyploidy for some populations (Malacrida et al.