Save
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.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't know
Remaining cards (0)
Know
0:00
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

Chapter 16

TermDefinition
population genetics the study of the frequency and interaction of alleles and genes in populations
microevolution a change in the collective genetic material of a population
bell curve a symmetrical frequency curve
gene pool all of the genes of the reproductively active members of a population
allele frequency the proportion of gene copies in a population that are a given allele, expressed as a percentage
phenotype frequency the ratio if individuals with a particular phenotype to the total number of individuals in a population
Hardy-Weinberg genetic equilibrium the principle that states that the frequency of alleles in a population does not change unless evolutionary forces act on the population
immigration the movement of an individual or a group to a new community or region
emigration the movement of an individual or group out of its native area
gene flow the movement of genes into or out of a population due to interbreeding
genetic drift the random change in allele frequency in a population
sexual selection an evolutionary mechanism by which traits that increase the ability of individuals to attract or acquire mates appear with increasing frequency in a population; selection in which a mate is chosen on the basis of a particular trait or traits
stabilizing selection a type of natural selection in which the average form of a trait is favored and becomes more common
disruptive selection a type of natural selection in which two extreme forms of a trait are selected
directional selection a natural selection process in which one genetic variation is selected and that causes a change in the overall genetic composition of the population
speciation the formation of new species as a result of evolution
morphology the study of the structure and form of an organism
biological species concept the principle that defines a species as a group of organisms whose members can interbreed to produce offspring
geographic isolation the physical separation of populations due to geographic barriers that prevent interbreeding
allopatric speciation species that arise as a result of geographic isolation
reproductive isolation the inability of members of a population to successfully interbreed with members of another population of the same or a related species
prezygotic isolation type of reproductive isolation that occurs before fertilization
sympatric speciation occurs when two subpopulations become reproductively isolated within the same geographic area.
gradualism a model of evolution in which gradual change over a long period of time leads to biological diversity
punctuated equilibrium a model of evolution in which short periods of drastic change in species, including mass extinctions and rapid speciation, are separated by long periods of little or no change
postzygotic isolation type of reproductive isolation that occurs after fertilization
Created by: FarlowA20
 

 



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