World English Dictionary
pleiotropism (plaɪˈɒtrəˌpɪzəm)
genetics the condition of a gene of affecting more than one characteristic of the phenotype

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American Heritage
Medical Dictionary

pleiotropism plei·ot·ro·pism (plī-ŏt'rə-pĭz'əm) or plei·ot·ro·py (-pē)
The control by a single gene of several distinct and seemingly unrelated phenotypic effects.

plei'o·trop'ic (plī'ə-trŏp'ĭk, -trō'pĭk) adj.
The American Heritage® Stedman's Medical Dictionary
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