somatic aneuploidy

somatic aneuploidy

[sō′mad·ik ′a·nyü‚plȯid·ē]
(cell and molecular biology)
An irregular variation in number of one or more individual chromosomes in the cells of a tissue.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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In other words, somatic aneuploidy means that the chromosomal imbalance occurs in a particular cell after the body is formed.