A testcross with a heterozygous dominant individual will yield only heterozygous dominant offspring.

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A testcross involves crossing an individual with a homozygous recessive individual to determine the genotype of the original individual. Therefore, if a heterozygous dominant individual is testcrossed with a homozygous recessive individual, the offspring will be a mix of heterozygous and homozygous recessive individuals.

A Testcross with a Heterozygous Dominant Individual Will Yield Only