If a plant variety is true-breeding for a dominant trait, then __________.

• A. if the plant were allowed to self-pollinate, the dominant and recessive traits would consistently appear in a 3:1 ratio among the progeny
• B. the plant is heterozygous for the trait
• C. if the plant were crossed with a heterozygote, one-half of the progeny would show the dominant trait, and one-half would show the recessive trait
• D. the variety is unable to mutate
• E. if the plant were allowed to self-pollinate, all of the progeny would have the dominant trait

Answer: (E)