In a certain species of sweet pea plant, flowers are either purple or white. Colour is determined by two unlinked, genes. The alleles of the first gene are X and x; those of the second gene are Y and y. In order to bear purple flowers, a plant must possess at least one X and one Y allele. Those genotypes which fail to do so, result in the formation of white flowers. If two purple-flowered plants of genotype XxYy are crossed then the expected phenotypic ratio of offspring would be
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