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Question

A test cross is carried out to
  1. Assess the number of alleles of a gene
  2. Determine whether two species or varieties will breed successfully
  3. Predict whether two traits are linked
  4. Determine the genotype of a plant at F2

A
Predict whether two traits are linked
B
Determine whether two species or varieties will breed successfully
C
Assess the number of alleles of a gene
D
Determine the genotype of a plant at F2
Solution
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When a tall plant from F1 or F2 has TT or Tt composition, its genotype cannot be predicted. Therefore, to determine the genotype of a tall plant at F2, Mendel crossed the tall plant from F2 with a dwarf plant. This, he called a test cross. In a typical test cross, an organism showing a dominant phenotype (and whose genotype is to be determined) is crossed with the recessive parent instead of self-crossing. The progenies of such a cross can easily be analysed to predict the genotype of the test organism.
So, the correct answer is ' Determine the genotype of a plant at F2

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Q1
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