The Collaborative International Dictionary of English v.0.48:
Monogenic \Mon`o*gen"ic\, a. 1. (Biol.) Of or pertaining to monogenesis. [1913 Webster] 2. (Zool.) Producing only one kind of germs, or young; developing only in one way. [1913 Webster]WordNet (r) 3.0 (2006):
monogenic adj 1: of or relating to an inheritable character that is controlled by a single pair of genes