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In a snapdragon cross, two pink-flowered (Rr) plants are crossed. What fraction of the F1 offspring is expected to be phenotypically identical to the original red parents?
AThree quarters
BOne half
COne quarter
DTwo thirds
Answer & Solution
Correct answer: A. Three quarters
Rr x Rr gives 1 RR : 2 Rr : 1 rr. Only RR plants are red. With incomplete dominance, Rr plants are pink and rr are white. The red fraction is therefore one quarter.
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