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Why did Mendel cross a tall F2 plant with a dwarf plant?
ATo make it self-pollinate
BTo produce a hybrid
CTo find if it was TT or Tt
DTo raise flower colour
Answer & Solution
Correct answer: C. To find if it was TT or Tt
Looking at a tall plant cannot show whether it is TT or Tt, so the test cross exposes its genotype.
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