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

Ch 15 + 16 Vocab

QuestionAnswer
Adaptation Any inherited characteristic that increases an organism’s chance of survival.
Artificial Selection Selection by humans for breeding of useful traits from the natural variation among different organisms.
Behavioral Isolation Form of reproductive isolation in which two populations have differences in courtship rituals or other types of behavior that prevents them from interbreeding.
Common Descent Principle that all living things were derived from common ancestors.
Descent with Modification The principle that each living species has descended, with changes, from other species over time.
Directional Selection Form of natural selection in which the entire curve moves; occurs when individuals at one end of a distribution curve have higher fitness than individuals in the middle or at the other end of the curve.
Disruptive Selection Form of natural selection in which a single curve splits into two; occurs when individuals at the upper and lower ends of a distribution curve have higher fitness than individuals near the middle.
Evolution Change over time.
Fitness The ability of an individual to survive and reproduce in its specific environment.
Fossil Preserved remains of ancient organisms.
Founder Effect Change in allele frequencies as a result of the migration of a small subgroup of a population.
Gene Pool Combined genetic information of all the members of a particular population.
Genetic Drift Random change in allele frequencies that occurs in small populations.
Genetic Equilibrium Situation in which allele frequencies remain constant.
Geographic Isolation Form of reproductive isolation in which two populations are separated physically by geographic barriers such as rivers, mountains, or stretches of water.
Hardy/Weinberg Principle Principle that allele frequencies in a population will remain constant unless one or more factors cause the frequencies to change.
Homologous Structures Structures that have different forms in different organisms but develop from the same embryonic tissues.
Natural Selection Survival of the fittest.
Polygenic Traits Traits controlled by two or more genes.
Relative Frequency Number of times an allele occurs in a gene pool compared with the number of times other alleles occur.
Reproductive Isolation Separation of species or populations so that they cannot interbreed and produce fertile offspring.
Single Gene Traits Traits controlled by a single gene that has two alleles.
Speciation Formation of new species.
Stabilizing Selection Form of natural selection by which the center of the curve remains in its current position; occurs when individuals near the center of a distribution curve have higher fitness than individuals at either end.
Struggle for Existence Members of each species compete regularly to obtain food, living space, and other necessities of life.
Survival of the Fittest Process by which individuals that are better suited to their environment survive and reproduce most successfully; also called natural selection.
Temporal Isolation Form of reproductive isolation in which two populations reproduce at different times.
Theory A well supported testable explanation of phenomena that have occurred in the natural world.
Vestigial Organs Organs that serve no useful function in an organism.
Created by: nbas_finest
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