View the step-by-step solution to:

Question

A large population of squirrels becomes divided into two by the formation of a mountain range, due to tectonic

uplift. Then 500,000 years later, an earthquake and subsequent erosion by a river opens up a canyon corridor, which allows the two disconnected populations to rejoin in the middle of the mountain range. When the squirrel populations from the two sides of the mountain range encounter each other, they look identical, but possess very different courtship behavior. Females only respond to courtship displays from males characteristic of their own population. Genetic testing in the area of contact indicates that no interbreeding has occurred.

In paragraph form, address the following questions:


1) Has speciation occurred? Justify your answer.


2) What has happened to the populations on opposite sides of the mountain genetically?


3) If speciation has occurred, what kind(s) of isolating mechanisms are at play?


4) If we collected genetic data and produced a cladogram of these two populations along with other distantly related squirrel species, where would you expect these two populations to be found on the cladogram?

Top Answer

Sign up to view the full answer

Why Join Course Hero?

Course Hero has all the homework and study help you need to succeed! We’ve got course-specific notes, study guides, and practice tests along with expert tutors.

-

Educational Resources
  • -

    Study Documents

    Find the best study resources around, tagged to your specific courses. Share your own to gain free Course Hero access.

    Browse Documents
  • -

    Question & Answers

    Get one-on-one homework help from our expert tutors—available online 24/7. Ask your own questions or browse existing Q&A threads. Satisfaction guaranteed!

    Ask a Question
Ask a homework question - tutors are online