1. a. Describe, in your own words, the three major modes of selection and their general effects on..

1. a. Describe, in your own words, the three major modes of
selection and their general effects on population means and on population
variation.

b. Which mode of selection is at work on gall size of the gall-making
flies?

c. If parasitoid wasps became extinct, which mode of selection
would affect the next generation of gallmaking flies? Predict what would happen
to average gall size in subsequent generations.

2. Describe in your own words the difference between an experimental
study, an observational study, and a comparative study. What sorts of questions
are they each suited for (i.

1. a. Describe, in your own words, the three major modes of
selection and their general effects on population means and on population
variation.

b. Which mode of selection is at work on gall size of the gall-making
flies?

c. If parasitoid wasps became extinct, which mode of selection
would affect the next generation of gallmaking flies? Predict what would happen
to average gall size in subsequent generations.

2. Describe in your own words the difference between an experimental
study, an observational study, and a comparative study. What sorts of questions
are they each suited for (i.e., why dont researchers always use the
experimental method)? Give an example of each type of study from this chapter.

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