Explain how a variation that at one time gave a selective advantage became a disadvantage when the e

1. How did the finch population size and beak depth respond to drought years?  What about in years of heavy rainfall?

2. What selection pressure caused the change in beak depth? Explain.

3. Some mutations provide an organism a selective advantage in the environment and some provide a selective disadvantage. Give examples from the lesson of these different mutations.

4. Why do male peacocks have long, beautiful tails, which make it more difficult to escape from predators?

5. What variation exists in the peppered moth population? Is one of these variations considered an adaptation? Explain.   

6. Over 200 years ago, all of the peppered moths in a certain population were light-coloured. How could the first dark-coloured moth have occurred in the population? (Hint: How are new variations created in populations?)   

7. Explain how a variation that at one time gave a selective advantage became a disadvantage when the environment changed. How did this affect the variation in the population of peppered moths?