In dogs, curly tails are dominant over straight tails. If a pure curly-tailed dog is mated with a straight-tailed dog, what percentage of their offspring will have curly tails?

75%

Explanation:

If the two genes were equally dominant then the answer would be 50% because you have a 50/50 chance of getting a curly tailed dog. But since the curly tail gene is more dominant, the answer would have to be 75% because you are more likely to get a curly tailed dog.

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