The phenotypic ratio for the f1 generation that results from a testcross between a homozygous individual and a heterozygous individual is 1:1
test-cross is an test wherein an organism showing dominance for a specific trait must be tested for its genotype.
while an organism shows a dominant character, it may be homozygous or heterozygous for that character.
using the homozygous recessive organism, the genotype of the organism can be tested.
The test cross is done to decide the genotype of a dominant parent if it is a heterozygous or homozygous dominant. On the idea of the effects acquired in the ratio of the offspring, it could be expected that the parent is having which genotype. If all the offspring are of same phenotype, then the parent is homozygous dominant. If there may be 1:1 ratio inside the phenotype of the organisms, the determine is heterozygous dominant.
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