Components of Genetic variance

  • Phenotypic variance = Genotypic variance + Environment variance

i.e. Vp = Vg +Ve

  • Fisher (1918) divided the genotypic variance into three components:
  1. Additive
  2. Dominance
  3. Epistasis
  • Later Hayman and Mather partitioned the epistatic component into three types of interactions – viz.,
  • Additive x additive ; additive x dominance and dominance x dominance
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