1.
Because speciation is an historical event, it can be difficult to study. Make an outline listing the sections and subsections in this chapter, and then fill it in by describing the experimental and analytical approaches used in the case studies provided for each topic. In your opinion, which approaches to studying speciation described in this chapter are most powerful? Why?
To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.
2.
Why is "reinforcement" an appropriate name for the concept, introduced at the start of section 23.4 in your textbook, that natural selection should favor divergence if populations experience postzygotic isolation?
To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.
3.
Explain how isolation and divergence are occurring in soapberry bugs, even though populations occupy the same geographic area. Of the four evolutionary processes (mutation, gene flow, drift, and selection), which two are most important in causing this event?
To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.
4.
Why would genetic drift be an especially important evolutionary process causing divergence during colonization events? If colonists occupy a different habitat than the source population, why would natural selection also be an important process causing divergence?
To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.
5.
Why is it significant that soapberry bugs mate on their host plant? How does this fact affect gene flow among populations that exploit different host plants?
To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.
