What is involved in a test cross?

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(C) test cross is a genetic cross between an individual with an unknown genotype (usually showing the dominant phenotype) and an individual that is ho

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Crossing of an $F_1$ hybrid with a double recessive genotype

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(C) test cross is a genetic cross between an individual with an unknown genotype (usually showing the dominant phenotype) and an individual that is homozygous recessive for the trait in question.Its primary purpose is to determine the genotype of the individual displaying the dominant phenotype.If the individual is homozygous dominant,all offspring will show the dominant trait.If the individual is heterozygous,the offspring will show a $1:1$ ratio of dominant to recessive phenotypes.Therefore,crossing an $F_1$ hybrid with a double recessive genotype is the definition of a test cross.

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