To determine the precise genotype of an organism. Since do

To determine the precise genotype of an organism. Since dominant alleles are displayed with only 1 allele present it can be impossible to tell the difference between a homozygous dominant gene and a heterozygous gene as they have the same phenotype. However if you cross it with a homozygous recessive gene if it makes any recessive genes then it was heterozygous. If after many tests it does not make any recessive genes then it was homozygous dominant. This is because the homozygous dominant gene will give 1 dominant allele to each new gene making them all dominant. This process is called a test cross since you are testing the exact genotype of an organism to see if it is heterozygous or homozygous dominant.

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