Save
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

Theory of Evolution

QuestionAnswer
Evolution Change over time, the process by which modern organisms have descended from ancient organisms.
Natural Selection (Darwins) 1.All orgnsms prodce more offsprng than can actlly srvive.2.Evry orgnisms faces constnt strggle to srvive.3.The indvduls of gven species vary.4.The indvduls that are best adpted 2 the envrnmnt srvive.5.The indiv that srvive pass traits 2 their offsprng.
Lamarcks Theory of Natural Selection 1. Theory of need 2. Theory of use and disuse. 3. Theory of Inheritance of Acquired Characteristics.
Macroevolution The large scale evolutionary changes that take place over long periods of time.
Patterns of Macroevolution Mass extinctions, adaptive radiation, convergent evolution, coevolution, punctuated equilibrium, and changes in developmental genes.
Adaptive Radiation Studies of fossils or living organisms show that single species or a small group of species has evolved into several different forms that live in different ways.
Covergent Evolution The process by which unrelated organisms come to resemble one another. Example: wings or flippers function the same wa and look very similar.
Analogous Structures Structures that look and function similarly but are made up of parts that do not share common evolutionary history.Example: Dolphin flukes and fishs tails.
Coevolution The process by which two species evolve in response in changes in each other over time.
Rapid evolution after long periods of equilibrium can occur for Reason #1 When a small population becomes isolated from the main part of the population. The small populationcan then evolve more rapidly than the larger one because genetic changes can spread more quickly among fewer individuals.
Rapid evolution after long periods of equilibrium can occur for Reason #2 When a small group of organisms migrates to a new environment.
Punctuated Equilibrium The pattern of long, stable periods interrupted by brief periods of more rapid change.
What does natural selection act on? Phenotypes
What does natural selection determine? Which alleles are passes from one generation to the next.
Natural selection can ___ change the relative frequencies of alleles in a population over time.
Evolution is ___ any change in the relative frenquencies of alleles in a population's gene pool.
Evolution acts on ___ population.
Natural selection can affect the distributions of phenotypes in three ways. 1. directional selection2. stabilizing selection3. disruptive selection
Directional Selection When individuals at one end of the curve have higher fitness than individuals in the middle or other end.
Stabilizing Selection When individuals near the center of the curve have higher fitness than individuals at either end of the curve.
Disruptive Selection When individuals at the upper and lower ends of the curve have higher fitness than individuals near the middle.
Genetic Drift Random change in the allele frenquencies that occurs in small populations.
Founder Effect A situation in which allele frequencies change as a result of migration of small subgroup of population.
The Hardy-Weinberg principle Allele frequencies in a population will remain constant unless one or more factors cause those frequencies to change.
Genetic Equilbrium The situation in which allele frequencies remain constant.
Five conditions are required to maintain genetic equilbrium from the generation to generation. There must be random mating, the population must by very large, and there can be no movement into or out of the population, no mutations,and no natural selection.
Speciation Formation of new species
Reproductive isolation When two members of two populations cannot interbreed to produce fertile offspring.
Behavioral Isolation When two populations are capable of interbreeding but have difference in courtship rituals or other types of bahavior.
Geographic Isolation Two populations are seperated by geographic barriers.
Temporal isolation two or more species reproduce at different times.
Created by: Kaaaylee
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