Often times genes display independent assortment, but express phenotypes independently. When genes at multiple loci determine a single phenotype, gene interaction is taking place. The effects of genes at one locus depends upon the presence of genes at different loci. This is termed gene interaction because the effect takes place between genes at different loci, determining the outcome of a phenotypic expression. The interaction between these genes at different loci results in new phenotypes that cannot be predicted based only upon allelic interactions at a single loci.
The excerpt below from Genetics by, Benjamin A. Pierce shows Mendel's cross of the pea plant where independence is shown in assortment during meiosis and in phenotypic expression.
The R/r alleles influence only the shape of the seed, but does not influence seed color.
Interactions among genes at more than two loci are more common, but the text and most professors will provide examples with genes interacting between two loci. The following example from the text involves two loci that determine one phenotype (fruit color), but usually, gene interaction takes place between genes at more than two loci.
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The excerpt below from Genetics by, Benjamin A. Pierce shows Mendel's cross of the pea plant where independence is shown in assortment during meiosis and in phenotypic expression.
Interactions among genes at more than two loci are more common, but the text and most professors will provide examples with genes interacting between two loci. The following example from the text involves two loci that determine one phenotype (fruit color), but usually, gene interaction takes place between genes at more than two loci.
Read the following important message regarding working problems with gene interaction:
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