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

question 16

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.

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