Which mating would be used as a test cross to determine whether an animal showing a dominant phenotype is homozygous or heterozygous?
Correct answer: B. Mating it with a homozygous recessive animal
- A. Mating it with a homozygous dominant animal
- B. Mating it with a homozygous recessive animal
- C. Mating it with an unrelated heterozygous animal
- D. Mating it with an animal showing the same phenotype
Explanation
A test cross uses a homozygous recessive partner. Recessive offspring reveal that the dominant-phenotype parent carries the recessive allele, whereas a homozygous dominant parent produces only dominant-phenotype offspring.
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