Tongue rolling is dominant over non-tongue rolling. If in a gene pool 60% of the alleles are dominant for tongue rolling, what percent of the population would have the non-tongue rolling phenotype?

40%

Explanation:

i would say it is

fumikage isn't really a bird, and tsuyu does have teeth. tsuyu has a transformation quirk which still allows her to be partially human. otherwise we'd have a large frog running around. fumikage has teeth because again, he isn't a bird. his head was a quirk mixture if i'm correct.