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Having a chromosome number greater than but not an exact multiple of the normal euploid number.

hy′per·ploid′ n.
hy′per·ploi′dy n.


(Biology) biology having or relating to a chromosome number that exceeds an exact multiple of the haploid number
ˈhyperˌploidy n


(ˈhaɪ pərˌplɔɪd)

having a chromosome number that is greater than but not a multiple of the diploid number.
hy′per•ploid′y, n.
References in periodicals archive ?
with the RNAi-mediated reduction of Brca1 resulting in abnormal spindle formation, chromosome misalignment, and a significant increase in hyperploid oocytes [3].
From Table 2, we can see a significant predominance of hypoploid cells compared to hyperploid. In this connection it should be noted that a significant number of hypoploid cells has an artifact origin, so the selection of cells to account should be more carefully.
Migration of chromatin material or chromosomes among adjacent meiocytes occurs through cytoplasmic channels as well as through cell wall dissolution [27] and can lead to the production of hyperploid and hypoploid cells.