Test cross involves

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(D) The correct answer is $D$. $A$ test cross is performed to determine the unknown genotype of an organism showing a dominant phenotype.
In a typica

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crossing the $F_1$ hybrid with a double recessive genotype.

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(D) The correct answer is $D$. $A$ test cross is performed to determine the unknown genotype of an organism showing a dominant phenotype.
In a typical test cross, an organism with a dominant phenotype is crossed with an individual that is homozygous recessive for the trait being investigated.
By analyzing the phenotypic ratio of the resulting progeny, the genotype of the parent organism can be determined.
For example, if an organism with a dominant trait (genotype $Tt$) is crossed with a homozygous recessive individual $(tt)$, the offspring will reveal whether the parent was homozygous dominant $(TT)$ or heterozygous $(Tt)$.

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