Introduction to Quantitative Genetics
Genetic Components of Genetic Variance
(cont.)
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
variance:
-
VG = VA + VD +
VI
The total phenotypic variance can be rewritten as:
-
VP = VA + VD +
VI + VE + VGE
Knowledge Gained from Measuring Genetic and Environmental Variances
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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.
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If the environmental variance is high, better performance would occur if
the environment in which the individual is grown are optimized.