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(B) test cross is a genetic cross between an individual with a dominant phenotype (whose genotype is unknown) and a homozygous recessive individual.Th

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Back crossing the hybrid with its recessive parent.

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(B) test cross is a genetic cross between an individual with a dominant phenotype (whose genotype is unknown) and a homozygous recessive individual.This cross is used to determine the zygosity of the dominant individual.If the offspring show a $1:1$ ratio of dominant to recessive phenotypes,the parent is heterozygous.If all offspring show the dominant phenotype,the parent is homozygous dominant.Therefore,it involves back-crossing the hybrid (or individual of unknown genotype) with its recessive parent.

$A$ test cross is performed by:

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