ACT Science Practice Question #1836 (Hard (510)) | Test Citadel
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ACT Science Difficulty: Hard (510)

Digital ACT Science Practice Question #1836

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Based on Table 28, the phenotypic ratio observed in the F2 generation closely approximates: Experiment Context (Dihybrid Inheritance in Pisum sativum): Geneticists crossed two heterozygous pea plants (YyRr x YyRr), where Y (yellow seeds) is dominant to y (green seeds), and R (round seeds) is dominant to r (wrinkled seeds). F2 offspring counts (total = 1,600 seeds) were tabulated: Table 28: - Phenotype 1: Yellow & Round = 905 seeds - Phenotype 2: Yellow & Wrinkled = 296 seeds - Phenotype 3: Green & Round = 302 seeds - Phenotype 4: Green & Wrinkled = 97 seeds
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Dihybrid heterozygous cross yields 9:3:3:1.

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905 : 296 : 302 : 97 is approximately 9:3:3:1 (Mendel's classical dihybrid ratio)....

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