Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


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
Know
remaining cards
Save
0:01
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:
Retries:
restart all cards




share
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

Bio: Chapter 24

TermDefinition
Speciation The process by which one species splits into two or more species.
Macroevolution The broad pattern of evolution over long spans of time.
Species A group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring.
Reproductive Isolation The existence of biological factors (barriers) that impede members of two species from producing viable, fertile offspring.
Hybrids Offspring that result from an interspecific mating.
Prezygotic Barriers Block fertilization from occurring .
Postzygotic Barriers May contribute to reproductive isolation after the hybrid zygote is formed.
Morphological Species Concept Characterizes a species by body shape and other structural features.
Ecological Species Concept Views a species in terms of nits ecological niche, the sum of how members of the species interact with the nonliving and living parts of their environment.
Phylogenetic Species Concept Defines a species as the smallest group of individuals that share a common ancestor, forming one branch on the tree of life.
Allopatric Speciation Gene flow is interrupted when a population is divided into geographically isolated subpopulations.
Polyploidy When a species originates from an accident during cell division that results in extra sets of chromosomes.
Autopolyploid An individual that has more than two chromosome sets that are all derived from a single species.
Allopolyploid A sterile hybrid that is changed into a fertile polyploid by various mechanisms.
Hybrid Zone A region in which members of different species meet and mate, producing at least some offspring of mixed ancestry.
Reinforcement A process in which natural selection strengthens pre zygotic barriers to reproduction, thus reducing the chances of hybrid formation. Such a process is likely to occur only if hybrid offspring are less fit than members of the parent species.
Punctuated Equilibria In the fossil record, long periods of apparent stasis, in which a species undergoes little or no morphological change, interrupted by relatively brief periods of sudden change.
Punctuated Pattern In a punctuated pattern, new species change most as they branch from a parent species and then change little for the rest of their existence.
Created by: Gianna B