AP BIOLOGY

Detailed explanation-1: -The correct answer: A testcross involves e. an F1 hybrid and an organism that is homozygous recessive for that trait. A test cross is widely used to determine the genotypic character of a specific plant. The dominant phenotype of any trait can be shown by both the homozygous dominant plant or heterozygous plant.

Detailed explanation-2: -When the cross is between an F1 hybrid with the homozygous recessive parent, it is known as a Test Cross.

Detailed explanation-3: -∙ The cross between recessive to its hybrid or its F1 plant is called a test cross. ∙ Test cross helps in determining the genotype of the hybrid plant by crossing F1 with the recessive parent.

Detailed explanation-4: -To identify whether the F1 hybrid is homozygous or heterozygous (hybrid), we can use a test cross with the first generation. In a test cross, a cross takes place in between a homozygous recessive trait and an unknown genotype (homozygous or heterozygous).

Detailed explanation-5: -In this cross, the unkown genotype is crossed with known homozygous recessive genotype. It is used to distinguish the pure homozygous (recessive) and hybrid (heterozygous dominant). Thus, the correct answer is option C.