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A **test cross** is the cross of an F₁ hybrid (or unknown dominant) with:
APure dominant parent
BHomozygous recessive parent
CAnother heterozygous individual
DF₂ generation
Answer & Solution
Correct answer: B. Homozygous recessive parent
Test cross = hybrid × homozygous recessive (e.g. Tt × tt). The progeny ratio reveals whether the dominant parent is TT (all tall offspring) or Tt (1:1 tall:dwarf), thereby disclosing the genotype.
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