A Testcross

A testcross

A) is used to determine if an organism that is displaying a recessive trait is heterozygous or homozygous for that trait.
B) results in the F2 generation having a phenotypic ratio of 1/2 dominant to 1/2 recessive.
C) is used when an individual with a dominant phenotype and unknown genotype is crossed to an individual with a recessive phenotype.
D) results in offspring that always display the recessive phenotype.