A testcross involves ____.

A) two individuals with dominant traits
B) two homozygous dominant individuals
C) two homozygous recessive individuals
D) an individual with a dominant trait and a heterozygous individual
E) an individual with a dominant trait and a homozygous recessive individual

Testcross

A genetic cross between a homozygous recessive individual and an organism of unknown genotype, to determine the unknown organism’s genotype based on the offspring’s phenotypes.

Homozygous Recessive

Referring to an individual carrying two copies of a recessive allele for a particular trait, which will be expressed in the organism's phenotype.

Dominant Trait

A genetic trait that is expressed in an organism even when only one copy of the gene responsible for the trait is present.