In a one-trait test cross,the phenotype that disappears in the F1 generation is the
A) dominant trait.
B) negative trait.
C) recessive trait.
D) heterozygote.
E) homozygote.

Question

Quizplus · Accepted Answer

In a one-trait test cross, the phenotype that disappears in the F1 generation is the recessive trait. This occurs when the individual being tested is heterozygous for the trait, so the dominant trait is expressed in the phenotype of the F1 generation. When the F1 individuals are crossed with homozygous recessive individuals, the recessive trait will only be expressed in the offspring if they inherit two recessive alleles, indicating that the F1 individuals must be heterozygous carriers of the recessive trait.

In a One-Trait Test Cross,the Phenotype That Disappears in the F1