Respuesta :
A Test cross is mating of an individual with an unknown genotype and an individual with recessive genotype of the same trait.
The test cross is performed to determine the genotype of dominant phenotype plant, whether it is homozygous or heterozygous dominant.
The resulting progeny ratio helps to predict the parent genotype. That is, If all the progenies show dominant phenotype, then the unknown parent is homozygous dominant. If they show a 1:1 ratio, then the parent is heterozygous dominant.
In other terms, homozygous dominant parent (PP) crossing with recessive parent (pp) can only produce progenies with dominant phenotype (PP / Pp), while heterozygous dominant parent (Pp) with recessive parent (pp) can produce both dominant and recessive progenies (PP / Pp / pp).
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