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A test that determines if an organism is homozygous dominant or heterozygous; an organism of unknown genotype but dominant phenotype is crossed with a homozygous recessive organism. If any of the offspring show the recessive phenotype, then the genotype of the parent being tested is heterozygous for that trait. (Examples of expected outcomes: TT X tt = Tt; Tt X tt = 1/2 Tt and 1/2 tt.)

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1. A test that determines if an organism is homozygous dominant or heterozygous; an organism of unknown genotype but dominant phenotype is crossed with a homozygous recessive organism. If any of the offspring show the recessive phenotype, then the genotype of the parent being tested is heterozygous for that trait. (Examples of expected outcomes: TT X tt = Tt; Tt X tt = 1/2 Tt and 1/2 tt.)





 
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