Test cross
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In genetics, a test cross is used to determine whether an individual that displays a dominant phenotype is homozygous or heterozygous. The individual is crossed with a homozygous recessive individual. If all progeny display the dominant phenotype, the individual in question is homozygous dominant; if the progeny are split equally between the dominant and recessive phenotype, the individual is heterozygous.
Test Cross crosses a homozygous recessive with an individual with an unknown genotype. If all the offspring are dominant phenotype, the individual is Homozygous Dominant. If the offspring are half dominant and half recessive, the individual is Heterozygous.
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