Introduction to Quantitative Genetics
Genetic Components of Genetic Variance
Interaction Genetic Variation - variation associated with the interactions
between genes; the genetic basis of this variance is epistasis, and it is
called the interaction genetic variance (VI).
The total genetic variance can be partitioned into the three forms of
VG = VA + VD +
The total phenotypic variance can be rewritten as:
VP = VA + VD +
VI + VE + VGE
Knowledge Gained from Measuring Genetic and Environmental Variances
If a large portion of the variance is genetic, then gains can be made from
selecting individuals with the metric value you wish to obtain.
If the environmental variance is high, better performance would occur if
the environment in which the individual is grown are optimized.