In the canopy of a bioluminescent forest, the twilight orchid (Orchis nocturna) displays petal illumination governed by a single gene with two incompletely dominant alleles: $C^B$ for bright blue luminescence and $C^Y$ for vibrant yellow luminescence. Crossing a homozygous blue orchid ($C^B C^B$) with a homozygous yellow orchid ($C^Y C^Y$) produces an $F_1$ generation in which every individual displays an intermediate emerald-green glow ($C^B C^Y$). If a field researcher crosses an emerald-green orchid with a true-breeding yellow-glowing orchid, what phenotypic proportions are expected among the resulting offspring?

A) 50% emerald-green glowing and 50% vivid yellow glowing

B) 25% bright blue glowing, 50% emerald-green glowing, and 25% vivid yellow glowing

D) 75% vivid yellow glowing and 25% emerald-green glowing

Incomplete dominance Original Scenario-Based Practice

Biology · Heredity · Biology · Non-Mendelian Genetics

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Heredity · Biology

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