In maize,overall kernel color is controlled by both the endosperm and the aleurone colors.The endosperm color is yellow when the allele Y is present.In the homozygous recessive (y/y)condition the endosperm is white.The Y alleles are masked by the presence of a colored aleurone.The R and Pr genes control the aleurone color.The allele Pr interacts with the R allele to produce a purple color,whereas in the recessive condition (pr/pr),the gene interacts with the R allele to produce a red color.If the R allele is present in the homozygous recessive state (r/r)then the aleurone will be colorless,allowing the endosperm color to be expressed.Two fully heterozygous individuals are crossed.Give the phenotypes,and frequency of occurrence,of the F2 offspring.