A test cross is used to determine whether an individual with
A) a dominant phenotype is heterozygous or homozygous.
B) a dominant genotype is heterozygous or homozygous.
C) a recessive phenotype is heterozygous or homozygous.
D) a recessive genotype is heterozygous or homozygous.
E) None of the above

Question

Quizplus · Accepted Answer

A test cross involves mating the individual with the dominant phenotype (but unknown genotype) with a homozygous recessive individual. The phenotype of the offspring can reveal whether the dominant individual is heterozygous or homozygous for the dominant allele. If all the offspring show the dominant phenotype, then the dominant individual is likely homozygous. If some offspring show the recessive phenotype, then the dominant individual is likely heterozygous.

A Test Cross Is Used to Determine Whether an Individual