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. Often, the other individual used is a parent of the one under question.
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