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

F26 Evolution Con 1

F26 Unit 7 Evolution Con 1 Natural Selection

QuestionAnswer
What is evolution? The process of biological change in populations over time that makes descendants genetically different from their ancestors.
What are the two types of evolution? Microevolution (small-scale within a population) and macroevolution (large-scale across species).
Who developed the theory of natural selection? Charles Darwin.
Where did Darwin make key observations? On the Galapagos Islands.
What does 'survival of the fittest' mean? Organisms with the best traits live longer and reproduce more.
What is 'fitness'? A measure of how well an organism can survive in its environment.
What are the four principles of natural selection? Overproduction of offspring, variation, adaptation, and descent with modification.
What causes competition in populations? Overproduction of offspring and limited resources.
What is variation? Differences in physical traits of organisms.
What are the sources of variation? Random mutations, genetic recombination during meiosis, and migration (gene flow).
What is an adaptation? A feature that allows an organism to better survive in its environment.
What happens to beneficial traits over time? They become more common because they help organisms survive and reproduce.
Who evolves: individuals or populations? Populations evolve, not individuals.
What changes during evolution? The gene frequency (allele frequency) in a population over time.
What is the gene pool? The combined alleles of all individuals in a population.
What is mutation? Any change in DNA sequence; creates new genotypes and phenotypes.
How do mutations affect evolution? Increase variation and can be harmful, neutral, or beneficial.
What is natural selection (as a mechanism)? Organisms more fit for their environment survive and reproduce more, passing on beneficial traits.
What is genetic drift? Random change in allele frequency over time, especially in small populations.
What is gene flow? Movement of genes into or out of a population through migration.
What is sexual selection? Non-random mating based on traits that improve chances of reproduction rather than survival.
When does crossing over occur in Meiosis? Prophase 1
What is descent with modification? A change in gene frequency over time.
Created by: tmsullivanLDHS
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