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.

Remove Ads
Don't know
Know
remaining cards
Save
0:01
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards




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 20

"Genes Within Populations" Evolutionary Biology, BIO 152 CSU Chico

QuestionAnswer
inheritance of acquired characteristics changes that individuals acquired during their lives were passed on to their offspring.
population genetics the study of the properties of genes in populations
the requirements to be in Hardy-Weinberg equilibrium no mutation, no genes are transferred to or from other sources, mating is random, population size is very large, no selection occurs.
gene flow the movement of alleles from one population to another
assortive mating phenotypically similar individuals mate
genetic drift frequencies of particular alleles may change drastically by chance alone
founder effect one or a few individuals disperse and become the founders of a new, isolated population at some distance from their place of origin
bottleneck effect populations may be drastically reduced in size, this may result from flooding , drought, epidemic disease, and other natural forces, or from changes in the environment
fitness quantify reproductive success
frequency-dependent selection the fitness of a phenotype depends on its frequency within the population
oscillating selection favors one phenotype at one time and another phenotype at another time
heterozygote advantage favors individuals with copies of both alleles and thus works to maintain both alleles in the population
disruption selection selection acts to eliminate intermediate types
directional selection selection acts to eliminate one extreme from an array of phenotypes, the genes promoting this extreme become less frequent in the population and may eventually disappear
stabilizing selection selection acts to eliminate both extremes from an array of phenotypes, increasing the frequency of the already common intermediate type
assortive mating a. affects genotype frequencies expected under Hardy-Weinberg Equilibrium b. affects allele frequencies expected under Hardy-Weinberg equilibrium c.has no effect on the genotypic frequencies expected under Hardy-Weinberg a. affects genotype frequencies expected under Hardy-Weinberg Equilibrium
relative fitness a. refers to the survival rate of one phenotype compared to that of another b.refers to the reproductive success of a phenotype d. none a. refers to the survival rate of one phenotype compared to that of another