2. The Concept of Heterosis Hybrid heterosis and hybrid vigor Types of Heterosis: 1)vegetative, 2) productive adaptive Measurement of Heterosis p 118-119 (1)Mid-parent heterosis (2)Over-parent heterosis 3)Over-standard (Over check heterosis) (4)Heterotic Index2. The Concept of Heterosis ▪ Hybrid heterosis and Hybrid vigor ▪ Types of Heterosis: 1) vegetative, 2) productive 3)adaptive ▪ Measurement of Heterosis p. 118-119 (1) Mid-parent heterosis (2) Over-parent heterosis (3) Over-standard (Over check heterosis) (4) Heterotic Index