In maize, the trait for the purple kernel (P) is dominant over the yellow kernel (p). A plant with purple kernels is crossed with another plant with yellow kernels and produces 2 offspring with purple kernels and 2 offspring with yellow kernels.
(a) What is the genotype of the parental maize plants?
(b) Draw a Punnett square to depict the cross between the two offspring with purple kernels.
(c) Identify the genotypic and phenotypic ratios obtained from the cross in (b).