(Answered) After crossing tobacco plants with purple stem green leaves

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After crossing tobacco plants with purple stem, green leaves and nonpurple stem, yellow leaves, in F2 students observed following results:

purple stem, green leaves 1297
nonpurple stem, green leaves 469
purple stem, yellow leaves 433
nonpurple stem, yellow leaves 164

Suggest a hypothesis how the traits are controlled and use Chi-square test to test your hypothesis

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