Mating an individual expressing a dominant phenotype, but whose genotype is unknown, with an individual expressing the corresponding recessive phenotype is an example of: A) a heterozygous cross. B) an F₁ cross. C) an F₂ cross. D) a parental cross. E) a test cross.

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A test cross is used to determine the genotype of an individual expressing a dominant phenotype by crossing it with an individual expressing the recessive phenotype.

Mating an Individual Expressing a Dominant Phenotype, but Whose Genotype