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What fraction of offspring from an RrYy x RrYy self-cross is expected to show at least one dominant trait (round or yellow, i.e., not rryy)?

Question
What fraction of offspring from an RrYy x RrYy self-cross is expected to show at least one dominant trait (round or yellow, i.e., not rryy)?
1/16
9/16
15/16
3/16
Answer
15/16
Detailed Explanation
Since only 1/16 of offspring are rryy (fully recessive), the remaining 15/16 show at least one dominant phenotype.
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