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chromosomal aberration

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chromosomal aberration

–noun Genetics.
any irregularity or abnormality of chromosome distribution, number, structure, or arrangement.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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chromosomal aberration

noun
any change in the normal structure or number of chromosomes; often results in physical or mental abnormalities 
WordNet® 3.0, © 2006 by Princeton University.
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