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Theoretical distributions of phenotypes in the F2 generation. The distributions were generated using the following assumptions:

  1. Heritability = 1.0
  2. A 12-unit difference between the parents is controlled by various numbers of genes with equal phenotypic effects.
  3. There is no linkage.
  4. Dominance is unidirectional.
The graphs demonstrate that as the number of genes which controls a phenotype increases, phenotypic variance becomes less discrete and more continuous.

 

Theoretical distributions of phenotypes in the F2 generation. The distributions were generated using the following assumptions:

  1. The phenotype is controlled by a single gene.
  2. There is a 12-unit difference between the parents.
  3. The effect of the environment ranges from 0% (heritability = 100%) to 75% (heritability = 25%)

The graphs demonstrate that as the environmental influence on a phenotype increases, phenotypic variance becomes less discrete and more continuous.