Genic Interaction Factor Hypothesis, Non-Allelic Gene Interaction, Allelic Gene Interaction, Complementary Factors, Supplementary Factors

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Genic Interaction (Factor Hypothesis)

The expression of a single character by the interaction of more than one pair of genes is called genic interaction or interaction of genes.

Bateson and Ponnet proposed factor hypothesis to explain genic interaction. According to this hypothesis, some characters are produced by the interaction of two or more pairs of factors (genes).

The genic interaction is of two types, namely
1. Non-allelic gene interaction.
2. Allelic gene interaction.

The genic interaction occurring between genes located in different locus of the same chromosome of different chromosomes is known as non-allelic gene interactions.

The genic interaction between the two alleles of a single locus is known as allelic gene interaction.

Some of the important forms of genic interactions are as follows:-

1.Complementary factors	Non-allelic gene interaction
2. Supplementary factors
3. Epistasis
4. Duplicating factors
5. Complete dominance	Allelic Gene interaction
6. Incomplete dominance
7. Co-dominance
8. Blending inheritance

9. Cumulative genes or Multiple genes or polygenes
10. Pleiotropism.

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