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NEETZoologyPrinciples of Inheritance and Variation

What is the test cross used for in Mendel's experiment with pea plants?

Options

  1. ATo measure the height of the plants
  2. BTo determine the genotype of the tall plant
  3. CTo produce more tall plants
  4. DTo change the phenotype of the plants

Correct answer

B. To determine the genotype of the tall plant

Step-by-step solution

From the preceeding paragraphs it is clear that though the genotypic ratios can be calculated using mathematical probability, by simply looking at the phenotype of a dominant trait, it is not possible to know the genotypic composition. That is, for example, whether a tall plant from F1 or F2 has TT or Tt composition, 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 organ

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