A cross of a dominant-phenotype individual (which may be either heterozygous or homozygous) with a homozygous-recessive individual.

A genetic cross between a heterozygote and the recessive homozygote.

A mating between a homozygous recessive and an animal with the phenotype of the dominant allele.

a method that allows us to determine what the unknown gynotype is (RR or Rr)

a way to distinguish the homozygous dominant ( PP ) from the heterozygote ( Pp )

Breeding an individual of unknown genotype to a homozygous recessive individual to reveal the unknown genotype. 266

Genetic crossing of an organism with known genotype (one that exhibits the recessive phenotype) with an individual expressing the dominant phenotype but of unknown heritage.

Also test mating. A mating designed to reveal the genotype of an individual for a small number of loci.

a mating between an individual of unknown genotype with an individual known to carry only the recessive alleles of the genes in question

A mating between a heterozygote and an individual homozygous for the recessive allele.

In genetics, a test cross is used to determine whether an individual that displays a dominant phenotype is homozygous or heterozygous. The individual is crossed with a homozygous recessive individual. If all progeny display the dominant phenotype, the individual in question is homozygous dominant; if the progeny are split equally between the dominant and recessive phenotype, the individual is heterozygous.