What are the classification of gene interactions ?

Explanation

Interactions take place between the alleles of the same gene i.e., alleles at the same locus is called intragenic or intralocus gene interaction. It includes the following:
(i) Incomplete dominance
(ii) Codonominanace
Multiple alleles
(iv) Pleiotropic genes are common examples for intragenic interaction.
Intergenic gene interactions.
Interlocus interactions take place between the alleles at different loci i.r between alleles of different genes. This is called intergenic interaction. Ex: Complementary genes interaction.