Unformatted text preview: Name ____________________________________________ Date ___________________ Period ______ Evolution WebQuest
Part A: Flip through the University of Utah “Learn Genetics” Lab (Recipe for Evolution) to answer the
1. What three things make up the “recipe” for Evolution?
● Variation in living organisms
● Inheritance of variation from parents of offspring
● Natural Selection
What are the two modes of genetic variation of organisms?
Mutation and recombination
a. How would a mutation increase genetic variation? (THINK about it! it’s not in the
video) This mutation has introduced a new allele into the population that increases genetic
variation and may be passes on to the next generation 2. _________________________
b. How would genetic recombination increase genetic variation?
Increases the genetic diversity in sexually reproducing organisms and can allow an organism
to function in new ways. b. Natural Selection
What are three types of selection pressures that could act on and eliminate organisms with
1. Stabilizing selection
2. Directional Selection
Disruptive Selection ii. Describe what happens to the organisms with the most favorable traits?
It may allow the organism to better adapt to
its enviroment and survive to reproduce iii. Summarize what is happening during natural selection (red/yellow slide).
Natural selection doesn’t make organisms better just good enough to enable an organism to pass
its genes to the next generation. Natural Selection also doesn’t move in a fixed direction. There is
no one, perfect way of doing something. Natural Selection is simply a process that enables
organisms to survive and reproduce in a local enviroment. c. Time
Explain the role of time in evolution
Biological evolution refers to the cumulative changes that occur in a population over time. These
changes are produced at the genetic level as organisms' genes mutate and/or recombine in
different ways during reproduction and are passed on to future generations. 2. In your own words, how do the 3 parts of the “ evolution recipe” work together to evolve species and
increase biodiversity. Part B: Learn about the basics of evolution at
3. What is evolution and what is it responsible for?
is the process by which modern organisms have descended from ancient ancestors,
its responsible for both remarkable similarities we see across all life and the amazing
diversity of that life. 4. [Click ‘next’] When does evolution take place?
Evolution only occurs when there is a change in gene frequency within a population over time. 5. Only inherited ______________________
differences that can be passed on are acted upon by evolution.
c 6. Compare the two examples of changes in beetle populations. Which of the two scenarios is an example of
evolution? Defend your answer with an explanation. 7. [Click ‘next’] Identify and describe the four basic mechanisms for evolutionary change in your own words!
Mechanism Description Mutation are the ultimate source of new alleles in a gene pool. Migration Many animals move from one place to another at certain times of the year
or during a particular period of their life cycle. Genetic Drift is the change in the frequency of an existing gene variant in a population
due to random sampling of organisms. Natural Selection Natural selection is the process by which heritable traits increase an
organism's chances of survival and reproduction. 8. Genetic drift and natural selection only take place if there is Genetic drift causes evolution by random chance due to
sampling error, whereas natural selection causes evolution
on the basis__________________.
of fitness. 9. [Click next several times to read about mutations] Now complete the paragraph below regarding gene flow.
“Gene flow, also called _________________,
is any movement of ______________
to another. Gene flow includes lots of different kinds of events, such
being blown to a new destination or people moving to new cities or gene
countries. If ______________
are carried to a population where those genes previously did not __________________,
can be a very important source of genetic
In the graphic on the website, the gene for _________________
coloration moves from one population to another.”
10. [Click next and read until you get to Genetic Drift] Summarize the idea behind genetic drift.
Genetic drift affects the genetic makeup of the population but, unlike natural
selection, through an entirely random process. So although genetic drift is a
mechanism of evolution, it doesn't work to produce adaptations. 11. [Click next] Natural selection is the most important mechanism behind evolution. This webpage gives you
an example of natural selection involving beetles. Read the descriptions and look at the cartoons. Explain what
has happened to this population of beetles, using the following terms: Adaptation, Survive, Reproduce, Gene,
Natural Selection, Species, and Evolution. 12. How do the finches of the Galapagos Islands demonstrate evolution?
the shape of finches' beaks on the Galapagos Islands has tracked weather patterns: after
droughts, the finch population has deeper, stronger beaks that let them eat tougher seeds. 13. [Click next] Fitness does not necessarily mean “strongest.” Defend this statement.
A genotype's fitness includes its ability to survive, find a mate, produce offspring
— and ultimately leave its genes in the next generation. ...
View Full Document
- Spring '16
What students are saying
As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.
Kiran Temple University Fox School of Business ‘17, Course Hero Intern
I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.
Dana University of Pennsylvania ‘17, Course Hero Intern
The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.
Jill Tulane University ‘16, Course Hero Intern