A phenomenon where one allele of a gene can overpower or subordinate the effect of a different gene's allele/s. This is a form of genetic interaction that produces unique genetic ratios. For example in an organism where gene A overpowered any effect of gene B, then at least 12 of the 16 possible combinations in a dihybrid cross would display the A characteristic. To see a display of this phenomenon, click on the DISPLAY button on the right. Note, if you do that, you will have to reenter the DEFINITIONS by going through the DIRECTORY.