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Numerical Chromosomal Abnormality
Definition 1
An irregularity in the number of chromosomes. (NCI Thesaurus)
Definition 2
The chromosomal constitution of cells which deviate from the normal by the addition or subtraction of chromosomes or chromosome pairs. In a normally diploid cell the loss of a chromosome pair is termed nullisomy (symbol: 2N-2), the loss of a single chromosome is monosomy (symbol: 2N-1), the addition of a chromosome pair is tetrasomy (symbol: 2N+2), the addition of a single chromosome is trisomy (symbol: 2N+1). (NLM, Medical Subject Headings)
Definition 3
chromosomal constitution of cells which deviate from the normal by the addition or subtraction of chromosomes or chromosome pairs. (NIH CRISP Thesaurus)
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