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heterokinesis

(hĕt′ə-rō-kə-nēsĭs, -kī-)
n.
  1. Differential distribution of X-chromosomes and Y-chromosomes during meiotic cell division.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.