A gene whose individual effect on a phenotype is too small to be observed, but which can act together with others to produce observable variation.
- Dormancy is a genetically complex trait controlled by polygenes with effects modified by the genetic background and environmental factors.
- Traditional quantitative genetic theory proposes that genetic variation in a quantitative trait is due to polygenes each with a small effect on the phenotype and being sensitive to the environment.
- The effects of polygenes on the ability to map oligogenes have been documented and taken into account in algorithms used for commonly used genetic crosses.
1940s: back-formation from polygenic.
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