A testcross involves A)two F₁ hybrids. B)an F₁ hybrid and an F₂ offspring. C)two parental organisms. D)an F₁ hybrid and the homozygous dominant parent. E)an organism of dominant phenotype but unknown genotype and an organism that is homozygous recessive for that trait.

Question

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A testcross involves crossing an organism of unknown genotype but with a dominant phenotype with an organism that is homozygous recessive for that trait. This allows the determination of the unknown genotype of the dominant organism by studying the phenotypes of their offspring.

A Testcross Involves