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(C) test cross is a genetic cross between an individual of unknown genotype (usually showing a dominant phenotype) and a homozygous recessive individu

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Determine whether $F_1$ plants are homozygous or heterozygous.

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(C) test cross is a genetic cross between an individual of unknown genotype (usually showing a dominant phenotype) and a homozygous recessive individual.It is specifically used to determine whether the individual showing the dominant phenotype is homozygous or heterozygous for a particular trait.If the offspring show a $1:1$ ratio of dominant to recessive phenotypes,the parent was heterozygous.If all offspring show the dominant phenotype,the parent was homozygous dominant.

$A$ test cross is performed to:

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