Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

terms 16.3

allopatric speciation A speciation in which biological populations are physically isolated by an extrinsic barrier and evolve intrinsic (genetic) reproductive isolation, such that if the barrier breaks down, individuals of the population can no longer interbreed.
biological species concept the concept that a species is a population of organisms that can interbreed but cannot breed with other populations
geographic isolation the physical separation of populations due to geographic barriers that prevent interbreeding
gradualism a model of evolution in which gradual change over a long period of time leads to biological diversity
morphology the study of the structure and form of an organism
prezygotic isolation isolation that occurs before fertilization
post zygotic isolation isolation that occurs after fertilization
reproductive isolation the inability of members of a population to successfully interbreed with members of another population of the same or related species
sympatric speciation occurs when two populations become reproductively isolated within the same geographic area
speciation the formation of new species as the result of evolution
punctuated equilibrium a model of evolution in which short periods of drastic change in species are separated by long periods of little to no change
Created by: Addaleigh