Question

In humans, the trait for tongue rolling is dominant over the trait for the inability of a human to roll his/her tongue. If a heterozygous male is crossed with a homozygous recessive female, then what percent of the offspring would be expected to have the ability to roll their tongues? A) 100% B) 75% C) 50% D) 25%

Answer 1

The answer is C. I just did the USAtestprep

Answer 2

You can use a punnet square to find this out:

t t
T Tt Tt Answer: C
t tt tt

Where T = Tongue rolling (dominant) and t = Incapable (recessive)