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A test cross in Mendelian genetics is performed by crossing an organism with the dominant phenotype with:
AThe recessive parent (homozygous recessive)
BA homozygous dominant
CA heterozygote
DItself (self-pollination)
Answer & Solution
Correct answer: A. The recessive parent (homozygous recessive)
A **test cross** = crossing the unknown-genotype dominant phenotype with a **homozygous recessive (tt)**. Progeny ratios reveal whether the dominant parent was TT (all dominant offspring) or Tt (1:1 ratio).
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