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A test cross is carried out to:

1. determine the genotype of a plant at F2.
2. predict whether two traits are linked.
3. assess the number of alleles of a gene.
4. determine whether two species or varieties will breed successfully.

Correct answer: determine the genotype of a plant at F2.

Solution

A test cross is designed to uncover the genotype of an individual showing a dominant phenotype by crossing it with a homozygous recessive. The offspring phenotypes then reveal whether the unknown parent carried one or two dominant alleles.

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