The ability for people to roll their tongue is dominant to people who cannot. If a tongue roller and a non-tongue roller were crossed, the highest percentage of potential non-tongue roller offspring would be which of the following?

A) 50%
B) 0%
C) 100%
D) 25%

option A 50%

Explanation:

Ability to roll the tongue is dominant to people who cannot. thus only one copy is needed for the trait to be expressed. Thus, a tongue roller could be XTXT, XTXt or XTY and a non could be XtXt and XtY.

Thus one can have the highest percentage of non-tongue roller to be 50% which is from a cross between a tongue roller male and a non tongue roller female.

it's c. (to reduce the greenhouse effect/carbon gasses)

b.