A testcross consists of a cross A)of two pure-breeding forms to find out which form of a gene is dominant. B)between two unknown forms to determine their genotypes. C)between an offspring and its homozygous dominant parent. D)of an organism of dominant phenotype but unknown genotype to an individual that is homozygous recessive for that trait. E)of two F₂ individuals to produce an F₃generation.

Question

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A testcross is done to determine the genotype of an organism with a dominant phenotype but unknown genotype. This is achieved by crossing the unknown organism with a homozygous recessive individual for that trait. The resulting offspring can be analyzed to determine the genotype of the unknown organism.

A Testcross Consists of a Cross