Save
Upgrade to remove ads
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
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. Your email address is only used to allow you to reset your password. See 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.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
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

WM Biology Chapter15

Vocab Words from Chapter 15

QuestionAnswer
Artificial selection Process of breeding organisms with specific traits in order to produce offspring with identical traits.
Natural selection Mechanism for change in populations; occurs when organisms with favorable variations survive, reproduce, and pass their variations to the next generation.
Mimicry Structural adaptation that enables one species to resemble another species; may provide protection from predators or other advantages.
Camouflage Structural adaptation that enables species to blend with their surroundings; allows a species to avoid detection by predators.
Homologous structure Structures with common evolutionary origins; can be similar in arrangement, in function, or both; provides evidence of evolution from a common ancestor; forelimbs of crocodilies, whales, and birds are examples.
Analogous structure Structures that do not have a common evolutionary origin but are similar in function.
Vestigial structure A structure in a present-day organism that no longer serves its natural purpose, but was probably useful to an ancestor; provides evidence of evolution.
Embryo Earliest stage of growth and devolopment of both plants and animals; differences and similarities among embryos can provide evidence of evolution.
Gene pool All of the alleles in a population's genes.
Allelic frequency Percentage of any specific allele in a population's gene pool.
Genetic equilibrium Condition in which the frequency of alleles in a population remains the same over generations.
Genetic drift Alteration of allelic frequencies in a population by chance events; results in disruption of genetic equilibrium.
Stabilizing selection Natural selection that favors average individuals in a population; results in a decline in population variation.
Directional selection Natural selection that favors one of the extreme variations of a trait; can lead to rapid evolution in a population.
Disruptive selection Natural selction that favors individuals with either extreme of a trait; tends to eliminate intermediate phenotypes.
Speciation Process of evolution of new species that occurs when members of similar populations no longer interbreed to produce fertile offspring within their natural environment.
Geographic isolation Occurs whenever a physical barrier divides a population, which results in individuals no longer being able to mate; can lead to the formation of a new species.
Reproductive isolation Occurs when formerly interbreeding organisms can no longer produce fertile offspring due to an incompatibility of their genetic material or by differences in mating behavior.
Polyploid Any species with multiple sets of the normal set of chromosomes; results from errors during mitosis or meiosis.
Gradualism Idea that species originate through a gradual change of adaptations.
Punctuated equilibrium Idea that periods of speciation occur relativively quickly with long periods of genetic equilibrium in between.
Adaptive radiation Divergent evolution in which ancestral species evole into array of species to fit a number of diverse habitats.
Divergent evolution Evolution in which species that once were similar to an ancestral species diverge; occurs when populations change as they adapt to different environmental condition; eventually resulting in a new species.
Convergent evolution Evolution in which distantly related organisms evolve similar traits; occurs when unrelated species occupy similar environments.
Created by: TBrylewski
Popular Biology sets

 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards