| aneuploid | <biology> The characteristic of having a chromosome complement that is not an exact multiple of the haploid number, with either fewer or more than the normal number of chromosomes in the cell. Chromosomes may be present in multiple copies (e.g. Trisomy) or one of a homologous pair may be missing in a diploid cell. This is an abnormal cell. (14 May 1997) |
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| aneuploidy | One or a few chromosomes above or below the normal chromosome number. For example, three number 21 chromosomes or trisomy 21 (characteristic of Down syndrome) is a form of aneuploidy. (12 Dec 1998) |