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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 from sexual reproduction
● Reproductive advantage
What are the two modes of genetic variation of organisms?
a. How would a mutation increase genetic variation? (THINK about it! it’s not in the
video) It would increase because mutation makes new alleles and new alleles leads to different
changes in genes and genotypes which cause genetic variation. Crossing over/Genetic Recombination
b. How would genetic recombination increase genetic variation?
The crossing over of two different people with different genes makes genetic variation more frequent
in the offspring. b. Natural Selection
What are three types of selection pressures that could act on and eliminate organisms with
1. Stabilizing selection
2. Disruptive selection
3. Directional Selection
ii. Describe what happens to the organisms with the most favorable traits?
They pass on their traits easier and more to the next generation. iii. Summarize what is happening during natural selection (red/yellow slide).
The species adapts to its environment, based on the environment changes around it. Example, giraffes grow
longer necks because leaves on trees got taller. c. Time
Explain the role of time in evolution
Changes occur in a population over time, which results in evolution. 2. In your own words, how do the 3 parts of the “ evolution recipe” work together to evolve species and
They help increase biodiversity and allele variation and frequency in populations over time which are the main factors
population. Part B: Learn about the basics of evolution at
3. What is evolution and what is it responsible for?
Evolution is the process by which modern organisms have descended from ancient ancestors. It creates diversity in populations over time. 4. [Click ‘next’] When does evolution take place?
Evolution only occurs when there is a change in gene frequency within a population over time. genetic
5. Only inherited ______________________
differences that can be passed on are acted upon by evolution. 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. Beetles of different color because, the brown beetles was a change in the
population over time which resulted in evolution. 7. [Click ‘next’] Identify and describe the four basic mechanisms for evolutionary change in your own words!
Natural Selection Description
A change in genes which can cause a variation in alleles.
The moving of one gene from a population to another gene population.
Different gene patterns in different generations.
Adapting to the environment, inheriting genes and alleles to survive. variation
8. Genetic drift and natural selection only take place if there is ___________________
__________________. 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 ______________
from one __________________
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
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 drifts , drifts the genetic makeup of a population, but it is a random process unlike natural selection. 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.
The brown population of beetles evolve which become more common to allow the beetles to have more offspring. They had to
make this happen because the green beetles were being eaten by the birds. For the species to survive they had to adapt. 12. How do the finches of the Galapagos Islands demonstrate evolution?
They were all on different places on the islands, which meant they had to eat different foods. Which led to natural selection and
adaptation , the different beaks were passed on to the offspring in the different areas of the islands which is evolution. 13. [Click next] Fitness does not necessarily mean “strongest.” Defend this statement.
It depends on the environment and pressure on the gene to move to relate to other genes. ...
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