Enter your Sign on user name and password.

Forgot password?
Sign In | Subscribe
Updated Biology Courses cardella

General Biology
Prof. Bryan Cardella, M.Ed.

 ap biology eaton

AP Biology 
Dr. Carleen Eaton, M.D.

Start learning today, and be successful in your academic & professional career. Start Today!
Loading video...
This is a quick preview of the lesson. For full access, please Log In or Sign up.
For more information, please see full course syllabus of Biology

  • Study Guides

Mechanisms of Evolution

  • The basis of change in populations, whether it’s a population of spiders, microorganisms, or people, occurs at the level of an organism’s genetic material—its DNA.

  • The patterns, trends, and rates of change can be evaluated broadly at the level of a species or specifically at the level of an allele.

  • When a population or a specific trait doesn’t change, it’s at equilibrium. However, this rarely occurs. Forces that elicit change are constantly bombarding any dynamic, living system.