The phenomenon of two or more genes affecting the expression of each other in different ways in the development of a single character of an organism is known as gene interaction. In gene interaction, expression of one gene depends on the presence or absence of another gene.
Interaction of genes may be either allelic (interallelic or intragenic) or non-allelic (intergenic)
Allelic Interactions occur between the alleles of the same gene that are located in identical
loci on different homologous chromosomes. On the other hand, non-allelic interactions
take place between the alleles of different genes that are located at different loci on the same
or different chromosomes. Some common examples of gene interaction.
I. Allelic Interactions: Incomplete dominance, overdomi
nance, codominance, multiple allelism, lethal gene action, pleiotropy
II. Non-allelic interactlons: The action of complementary, supplementary, duplicate,
polymeric, masking, inhibitory and epistatic genes
Interaction of genes may be either allelic (interallelic or intragenic) or non-allelic (intergenic)
Allelic Interactions occur between the alleles of the same gene that are located in identical
loci on different homologous chromosomes. On the other hand, non-allelic interactions
take place between the alleles of different genes that are located at different loci on the same
or different chromosomes. Some common examples of gene interaction.
I. Allelic Interactions: Incomplete dominance, overdomi
nance, codominance, multiple allelism, lethal gene action, pleiotropy
II. Non-allelic interactlons: The action of complementary, supplementary, duplicate,
polymeric, masking, inhibitory and epistatic genes
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