Test cross is

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(C) test cross is a genetic cross between an individual with a dominant phenotype (whose genotype is unknown,i.e.,either homozygous dominant or hetero

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Heterozygous dominant offspring $	imes$ Homozygous recessive parent

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(C) test cross is a genetic cross between an individual with a dominant phenotype (whose genotype is unknown,i.e.,either homozygous dominant or heterozygous) and a homozygous recessive individual.This cross is used to determine the genotype of the dominant individual.If the dominant individual is heterozygous $(Aa)$,the test cross with a homozygous recessive parent $(aa)$ results in a $1:1$ phenotypic ratio of dominant to recessive offspring.If the dominant individual is homozygous dominant $(AA)$,all offspring will exhibit the dominant phenotype.

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