endoreduplication
(ĕn′dō-rĭ-dōō′plĭ-kā′shən)- A form of polyploidy or polysomy characterized by redoubling of chromosomes, giving rise to four-stranded chromosomes at prophase and metaphase.
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The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.