The information provided is insufficient to determine the specific genotypes for two corn plants that, when crossed, will produce plants with 100% starchy kernels. The trait of starchiness in corn kernels is likely influenced by multiple genes, and additional details about the genetic makeup of the plants and the inheritance pattern of the trait are needed. Genotypes involve combinations of alleles for specific genes, and knowing the alleles carried by the parent plants is essential for predicting the outcomes of a cross. If you have specific information about the alleles associated with starchiness in corn, please provide that information for a more accurate analysis.
