Many species of plants provide an excellent example of epistasis, where multiple genes can control the phenotype. In the case of corn, there is a gene that controls color. The kernels can either be blue (B) or red (b). A different gene determines whether or not that color will actually appear in the kernel. The dominant allele (A) inhibits color, meaning the kernels will be white, while the recessive allele (a) allows color (either red or blue). If a plant that is heterozygous for both traits is self crossed, what will the resulting phenotypic ratios of the F1 generation be? (Hint: this is a dihybrid cross, but since epistasis does not follow Mendelian genetics, it will not be a 9:3:3:1 phenotypic ratio.)
