A test cross is carried out to:
Predict whether two traits are linked
Assess the number of alleles of a gene
Determine whether two species or varieties will breed successfully
Determine the genotype of a plant at F2
, a test cross is performed to determine the genotype of an organism showing a dominant phenotype (e.g., a tall plant from the F2 generation) whose genotype is unknown (TT or Tt). This involves crossing the organism with a recessive parent. The phenotype ratio of the progeny helps determine the unknown genotype .
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