Erayga "amphidiploid" waa eray nafley ah oo tilmaamaya noole ama unug ka kooban laba qaybood oo koromosoomyo ah oo ka kala yimid laba nooc ama noole waalid. Waa nooc ka mid ah polyploid, kaas oo ah noole ama unug leh noocyo badan oo koromosoomyo ah. Erayga "amphidiploid" waxaa inta badan loo adeegsadaa hidda-socodka iyo taranta dhirta si loo qeexo noole isku-dhafan oo leh koromosoomyo dhammaystiran oo mid kasta oo ka mid ah noocyada waalidkiisa. Amphidiploids caadi ahaan waa bacrin waxayna soo saari karaan galmo ahaan, laakiin sidoo kale waxay yeelan karaan astaamo hidde-siyeedyo gaar ah sababtoo ah isku-dhafka walxaha hidde-sidaha ee laba nooc oo kala duwan.