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Test cross in plants or in Drosophila involves crossing:

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

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

Solution

A test cross is designed to determine the genotype of an individual showing a dominant phenotype. Crossing that individual with a homozygous recessive partner lets the recessive alleles in the hybrid be exposed in the offspring.

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