The genotype of an organism with a dominant phenotype but unknown genotype can be inferred using a test cross. What genotype should a plant A_ be crossed to in a test cross?

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In a test cross, it is necessary to cross the organism with an unknown genotype to one with a homozygous recessive genotype (aa). This is because a homozygous recessive individual can only contribute a recessive allele, allowing the unknown genotype to be inferred from the phenotype of the offspring. Therefore, the best choice would be to cross the dominant phenotype plant A_ to a plant with a homozygous recessive genotype (aa).

The Genotype of an Organism with a Dominant Phenotype but Unknown