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nonpenetrant trait

(nŏn-pĕnĭ-trənt)
n.
  1. A genetic trait that is not manifested phenotypically because of factors outside its own locus.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.