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NEETZoologyPrinciples of Inheritance and Variation

What is the purpose of a test cross?

Options

  1. ATo produce more offspring
  2. BTo determine the genotype of an organism showing a dominant phenotype
  3. CTo measure the height of plants
  4. DTo increase genetic diversity

Correct answer

B. To determine the genotype of an organism showing a dominant phenotype

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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