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nonpenetrance

[ nŏn-pĕnĭ-trəns ]
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n.
The state in which a genetic trait although present in the appropriate genotype fails to manifest itself in the phenotype.
The obscuring of genetic traits by nongenetic mechanisms.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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