Frogs A wildlife biologist examines frogs for a genetic trait he suspects may be linked to sensitivity to industrial toxins in the environment. Previous research had established that this trait is usually found in 1 of every 8 frogs. He collects and examines a dozen frogs. If the frequency of the trait has not changed, what’s the probability he finds the trait in

1. None of the 12 frogs?

2. At least 2 frogs?

3. 3 or 4 frogs?

4. No more than 4 frogs?