Genetic Interaction
During the discussion of Mendel's monohybrid and dihybrid crosses, we encountered with the fact that for the determination of single 'phenotypic trait of an organism, two alleles or allelomorphs of a single gene interacted in various ways. Such as, out of two allelomorphs of a single gene, one allelomorphs might show (complete) dominance over the action of other which was recessive; or both allelomorphs night have partial or incomplete dominant relationship or both allelomorphs might have equal expression or co-dominant relationship. These kinds of genic or genetic interactions occur in between the two allelomorphs of a single type of gene and are usually referred to as inter-allelic or allelic or intra-genic genetic integractions. These kinds of genetic interactions give the classical ratios of 3: 1 and 9 : 3 : 3 : 1. But, in addition to intra-genic genetic interactions, Non-allelic or inter-genic genetic interactions also occur.
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