Encyclopedia AllABCDEFGHIJKLMNOPQRSTUVWXYZ P P-generation Parent generation (motherplant and fatherplant). Learn More → Polygenes (genetics:) A trait is determined by multiple segregating loci (polygenes), that cannot be identified individually…. Learn More → Polygenic Regulated by polygenes (polymery). More accurate: a polygenic trait is controlled by many genes (alleles),… Learn More →