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3. In one experiment, Mendel crossed a pea plant that bred true for green pods with one that bred true for yellow pods. All of the F1 plants had green pods. What does it mean when an organism like Mendel's pea plants is true breeding? Which form of the trait (green or yellow pods) is dominant? Explain how you arrived at your conclusion. 4. What type of mutation has occurred in the DNA of people with sickle cell anemia? (Look back, if you need to, to see what causes sickle cell.)