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Test cross involves

1. crossing between two F1 hybrids
2. crossing the F1 hybrid with a double recessive genotype
3. crossing between two genotypes with dominant trait
4. crossing between two genotypes with recessive trait

Correct answer: crossing the F1 hybrid with a double recessive genotype

Solution

A test cross is used to determine the genotype of an organism with a dominant phenotype by crossing it with a homozygous recessive individual. The offspring patterns reveal whether the dominant parent is homozygous or heterozygous.

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