The results of a test cross reveal that all the offspring resemble the parent being tested. This parent must be:

Question

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When all the offspring resemble the parent being tested, it indicates that the parent is homozygous for the trait being studied, meaning it has two identical alleles. This is because if the parent were heterozygous, then it would only pass on the dominant allele to some offspring and the recessive allele to others, resulting in a mixture of phenotypes in the offspring.

The Results of a Test Cross Reveal That All the Offspring