Introduction to Quantitative Genetics

Variance Components of a Quantitative Trait

V_P = V_G + V_E + V_GE where:

• V_P = total phenotypic variation of the segregating population
• V_G = genetic variation that contributes to the total phenotypic variation
• V_E = environmental contribution to the total phenotypic variation
• V_GE = variation associated with the genetic and environmental factor interactions