Sign In | Sign Up
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

Speciation

  • When Darwin proposed his theory of evolution by natural selection, he believed it helped explain the origin of the many species found on earth. For a new species to form, the passage of genes between two groups of organisms must be blocked.

  • Once each gene pool is isolated, natural selection can act on each population independently. If the populations encounter different conditions, they may evolve in different ways.

  • In this activity, we'll look at the types of barriers that can divide a population into separate species. We'll introduce the different ways a new species can evolve. We'll see what happens if two related species come into contact and breed with each other. Then, we'll look at the rate at which new species develop.

Educator®

Please sign in to participate in this lecture discussion.

Resetting Your Password?
OR

Start Learning Now

Our free lessons will get you started (Adobe Flash® required).
Get immediate access to our entire library.

Membership Overview

  • Available 24/7. Unlimited Access to Our Entire Library.
  • Search and jump to exactly what you want to learn.
  • *Ask questions and get answers from the community and our teachers!
  • Practice questions with step-by-step solutions.
  • Download lecture slides for taking notes.
  • Track your course viewing progress.
  • Accessible anytime, anywhere with our Android and iOS apps.

Use this form or mail us to .

For support articles click here.