Final answer:
To detect interaction between two genes, a gene interaction experiment must be performed. This experiment involves manipulating the genes of interest and observing the resulting phenotypic changes.
Step-by-step explanation:
To detect interaction between two genes, we must perform a gene interaction experiment. This experiment involves manipulating the genes of interest and observing the resulting phenotypic changes. One method of performing a gene interaction experiment is through the use of epistasis analysis, where the researcher examines how the expression of one gene affects the expression of another gene.