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(A) test cross is a genetic cross between an individual of unknown genotype (showing a dominant phenotype) and a homozygous recessive individual.It is

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Genotype

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(A) test cross is a genetic cross between an individual of unknown genotype (showing a dominant phenotype) and a homozygous recessive individual.It is used to determine the genotype of the individual showing the dominant trait.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.

$A$ test cross is important to determine the:

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