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

Carp115KeyEvolution

Prepare yourself for the evolution section of the Keystone Exam.

QuestionAnswer
What natural phenomenon increases the frequency of alleles if they are advantageous to a species' survival? Natural selection
What happens to a population if a phenotype is produced that is not a selective advantage? The population will decrease
What happens to a population that develops better alleles? populations evolve
What evolutionary factor prevents individuals from mating? prezygotic mechanisms
What prezygotic mechanism is characterized by species living in different areas separated by terrestrial and aquatic barriers? Geographical isolation
What prezygotic mechanism is characterized by individuals that do not mate because they are reproductively active at different times of the day? Temporal isolation
What prezygotic mechanism is characterized by individuals that mate only in certain preferred habitat? Ecological isolation
What prezygotic mechanism is characterized by individuals of different species that don't recognize each other sexual cues? Behavioral isolation
What prezygotic mechanism is characterized by the process of copulation occurring; however, the transfer of sperm does not take place? Mechanical isolation
What prezygotic mechanism is characterized by sperm transfer, but the egg is not fertilized? Gametic incompatibility
What evolutionary factor causes genomic incompatibility, hybrid inviability and/or sterility? Postzygotic isolating mechanisms
What postzygotic mechanism is characterized by by a fertilized egg, but the zygote does not develop? Zygotic mortality
What postzygotic mechanism is characterized by the hybrid forming, but is not viable? Hybrid inviability
What postzygotic mechanism is characterized by the hybrid is viable, but the resulting adult is sterile? Hybrid sterility
What postzygotic mechanism is characterized by the first generation hybrids are viable and fertile, but further hybrid generations are inviable or sterile? Hybrid breakdown
What evolutionary phenomenon occurs so that in each generation, some individuals may leave behind a few more descendents than other individuals? Genetic drift
Genetic drift tends to reduce genetic variation. Why is this a problem? It potentially reduces a populations ability to evolve in response to new selective pressures
Genetic drift acts faster and has more dramatic effects in small populations. Why is this a problem? Because it tends to happen most often in rare and endangered species
Genetic drift can contribute to speciation. Why is this significant? Because small isolated populations may diverge and from large populations creating a new species.
What are the two types of genetic drift? Bottleneck effect Founder's effect
What type of genetic drift occurs when a population's size is drastically reduced for at least one generation? Bottleneck effect
What is the negative impact of the bottleneck effect? reduced genetic variation
Why is reduced genetic variation bad for a population? the population may not be able to adapt to new environmental pressures because the genetic variation that selection would act on may have already drifted out of the population
What is a world known example of bottleneck effect? cheetah population - they were hunted to near extinction and now their gene pool is very shallow
What type of genetic drift occurs when a new colony is started by a few members of a population? Founder's effect
What two outcomes does the founder's effect tend to cause? 1. reduced genetic variation from the original population 2. a non-random sample of the genes in the original population
What is the best evidence of evolution that scientist use? Fossils
What type of evolutionary evidence show a pattern of development from early ancestors to modern descendants? Fossils
What are the four different types of evolutionary evidence? Fossils Anatomical Embryological DNA/Proteins
What type of evolutionary evidence compares different types of organisms to reveal basic similarities in body structure? Anatomical
What type of evolutionary structures are present in organisms, but are reduced in size and either have no or little function? Vestigial structure
What type of evolutionary structures are derived from a common ancestor or same evolutionary or developmental origin? Homologous structure
What type of evolutionary structures are found in different species, but have similar function? Analogous structures
What type of structure is a human appendix an example of? vestigial
What type of structure is a whale's hip bone an example of? vestigial
What type of structures are the forearm of a cat, crocodile and bat an example of? homologous
What type of structures are the wings of a bat and butterfly an example of? Analogous
From embryological evidence scientists know that all vertebrates at one point in their development have what three common structures? 1. a tail 2. buds that become limbs 3. pharyngeal pouches (gill slits)
Created by: carp115