What is gene interaction ? Give some example of gene interaction. Where are phenotypic ratios deviat from Mendelian ratio

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Gene interaction is a condition in which a single character is governed by two or more genes and each gene involved has an effect on the expression of other gene. It is of two types:
1. Allelic gene interaction
2. Non-allelic gene interaction

Example of gene interaction: In the concept of co-dominance, every allele involved in expression of the trait contributes equally.
Deviations from Mendel's phenotypic ratio (9:3:3:1) are: 12:3:1 (in case of dominant epistasis) and 9:3:4 (in case of recessive epistasis).

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