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(A) test cross is performed to determine the genotype of an $F_2$ plant showing a dominant phenotype.In a typical test cross,an organism with a domina

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determine the genotype of a plant at $F_2$

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(A) test cross is performed to determine the genotype of an $F_2$ plant showing a 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 the genotype of the parent organism.If the progeny shows a $1:1$ ratio of dominant to recessive phenotypes,the parent was heterozygous $(Aa)$.If all progeny show the dominant phenotype,the parent was homozygous dominant $(AA)$.

$A$ test cross is carried out to

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