In Some Flowers, a Purple Pigment Is Synthesized from a Red

Multiple Choice

In some flowers, a purple pigment is synthesized from a red precursor pigment.In the absence of all pigment, flowers are white.A pure-breeding plant with red flowers was crossed to a pure-breeding plant with white flowers.All of the F₁ plants had white flowers.The F₁ plants were crossed to each other, and the F₂ consisted of 165 plants: 123 with white flowers, 32 with purple flowers, and 11 with red flowers.How do these results suggest that flower color is determined?

A) One gene with two alleles exists and heterozygotes have a different phenotype than either homozygote.
B) The dominant allele of one gene masks the effect of a second gene.
C) The recessive allele of one gene masks the effect of a second gene.
D) A dominant allele of two genes is necessary for purple flowers.
E) A dominant allele of either of two genes is sufficient for purple flowers.