ACT Science Practice Question #1837 (Hard (520)) | Test Citadel
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ACT Science Difficulty: Hard (520)

Digital ACT Science Practice Question #1837

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What fraction of the F2 seeds display the double-recessive phenotype (green and wrinkled)? 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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Double recessive = 1/16.

Masterclass Solution & Distractor Trap Analysis

97 / 1,600 = 0.0606 ~ 1/16 (0.0625)....

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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