Final answer:
The Punnett square is the tool used to predict the percentage of offspring with a specific trait.
Step-by-step explanation:
The tool which would be used to predict the percentage of offspring that will have a specific trait is the Punnett square. Punnett square is a graphical tool used by biologists to calculate the probability of different combinations of alleles in the offspring of two individuals. It helps determine the possible genotypes and phenotypes of offspring by representing the genetic crosses between individuals.
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