In a plant, the allele for tall stems (t) is completely dominant to the allele for short stems (t). a second gene located on a separate chromosome determines flower color. the allele for purple flowers (e) is completely dominant to the allele for white flowers (e). a tall plant with white flowers is crossed with a tall plant whose flower color is unknown. the resulting f1 offspring population showed the following phenotype frequencies: phenotype frequency tall stems, purple flowers 3/8 tall stems, white flowers 3/8 short stems, purple flowers 1/8 short stems, white flowers 1/8 what are the genotypes of both parent plants?