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.

Remove ads
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

Category 3


Genetic Drift An evolutionary mechanism in which allele frequencies change in a population
Recombination Another source of heritable variation that occurs for two main reasons: independent assortment and crossing-over.
Gene Flow When the genes of one population flow to a different population.
Fossils What are preserved traces or remains of living organisms for the past
Vestigial Structures Structures on an organism are degenerated and, or are nonfunctional structures
Homologous Structures Structures that are similar in related organisms which were inherited from a common ancestor
Analogous Structures Structure that is the same in function but different in structure, and evolved independently
Molecular Homologies Evidence of evolution that has similar stretch of genetic material and/or proteins between different organisms
Biogeography This is the study of the distribution of species, organisms, and ecosystems through geological time
Stabilizing Selection most common form of natural selection in which organisms with extreme expressions of a trait are removed. Can be expressed on a graph
Directional Selection Shift of population toward an extreme version of a beneficial trait. Can be expressed on a graph
Disruptive Selection Process by which individuals with average traits are removed, creating two populations with extreme traits. Can be expressed on a graph.
Natural Selection Process that results in the adaptation of an organism to its environment by means of selectively reproducing changes in its genotype.
Evolution The process through which species change over time.
Species Groups of actually or potentially interbreeding populations, which are reproductively isolated from other such groups.
Adaptation Process by which an animal or plant species becomes fitted to its environment; it is the result of natural selection's acting upon heritable variation.
Taxonomy A hierarchical system for classifying and identifying organism
Common Ancestor The most recent ancestral form or species from which two different species evolved.
Created by: melissa1334