When carrying out a testcross for a single$-$gene Mendelian trait, if you observe two phenotypic classes in the offspring $($one class displaying the dominant phenotype and one class displaying the recessive phenotype$),$ which of the following would you conclude?

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both of the parents in the testcross were heterozygous

the parent displaying the dominant phenotype was homozygous

Incorrect:

the parent displaying the recessive phenotype was heterozygous

the parent displaying the dominant phenotype was heterozygous

Correct ansu

both of the parents in the testcross were homozygous