noun Genetics.
the phenomenon of one gene being responsible for or affecting more than one phenotypic characteristic.

1935–40; pleio- + -tropy

pleiotropic [plahy-uh-trop-ik, -troh-pik] , adjective
pleiotropically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Pleiotropy is when a gene can be expressed as many different phenotypes throughout the body.
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