A test cross with an organism with a homozygous recessive genotype results in 50% of the offspring exhibiting the recessive trait. What is the genotype of the test-cross parent? I. Homozygous recessive II. Homozygous dominant III. Heterozygous A. I only B. II only C. III only D. I or III E. II or III

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The answer is heterozygous. If it was crossed with homozygous dominant, then 100% of the offspring would show the dominiant trait. If it was homozygous recessive 100% of the offspring would have the recessive trait

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