1) Governed by a few genes 
(ol″ĭ-go-jen´ik) produced or influenced by the action of a few different genes.
A phenotypic trait produced by two or more genes working together.
Governed by a few genes e.g. oligogenic host resistance.
oligogene, oligogenic Controlled by a few genes responsible for major heritable changes. Related 'few, small, less, little' word units: micro-; mini-; mio-, meio-; nano-.