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Mendelian Genetics · Botany

What is the primary purpose of a 'Test Cross' in Mendelian genetics?

  1. To deliberately create an entirely new variety of hybrid plant.
  2. To prove that the Law of Dominance is always absolutely true.
  3. To count the total number of chromosomes in the cell.
  4. To find out if an organism is homozygous or heterozygous.
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Correct answer: To find out if an organism is homozygous or heterozygous.

A test cross involves crossing an individual with a dominant phenotype but unknown genotype with a homozygous recessive individual. If any offspring show the recessive phenotype, the parent must have been heterozygous.

Difficulty: Medium Question 5 of 20

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