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allosome

(ălə-sōm′)
n.
  1. A chromosome that differs from an ordinary autosome in form, size, or behavior; a sex chromosome.heterochromosome heterotypical chromosome
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.