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(A) : $A$ test cross is performed to determine the genotype of an organism showing the dominant phenotype. In a typical test cross,an organism with a

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test cross

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(A) : $A$ test cross is performed to determine the genotype of an organism showing the dominant phenotype. In a typical test cross,an organism with a dominant phenotype whose genotype is unknown is crossed with an individual that is homozygous recessive for the trait being investigated. The resulting progeny can be analyzed to determine whether the parent was homozygous dominant or heterozygous. This method is more precise than self-crossing for genotype determination.

The genotype of a plant showing the dominant phenotype can be determined by

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