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chro•mo•some



Pronunciation: (krō'mu-sōm"), [key]
n. Genetics.
any of several threadlike bodies, consisting of chromatin, that carry the genes in a linear order: the human species has 23 pairs, designated 1 to 22 in order of decreasing size and Xand Yfor the female and male sex chromosomes respectively.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

chromosomal aberrationchromosome number
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