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polyploidy

A Dictionary of Zoology | 1999 | | © A Dictionary of Zoology 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

polyploidy The condition in which an individual possesses one or more sets of homologous chromosomes in excess of the normal two sets found in diploid organisms. It is caused by the replication within a nucleus of complete chromosome sets without subsequent nuclear division. Examples are triploidy (3n), tetraploidy (4n), hexaploidy (6n), and octoploidy (8n).

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