Transcript Variation in Eastern Gray Squirrels

Variation in Eastern Gray
Squirrels
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• Tamera Williams [[email protected]]
Background Information
Natural environmental pressures
Human influences on squirrel populations
Background Information
Squirrel Habitat and food sources
How often do squirrels reproduce and what
is the size of their litters
Background Information
• What is the definition of natural selection
• What are the effects of environmental
pressure on natural selection
Background Information
• What are the effects of adaptations on
survival
• What are the effects of variation on
survival and reproductive success
Background Information
• What is meiosis and how does it contribute
to new gene combinations
• What is fertilization and how does it
concentrate to variation
Background Information
• How do phenotype and genotype differ
using the two types of squirrels as
examples
Background Information
• What is a mutation and what effect could
one have on an individual, population, the
environment
Background Information
• What is the relationship between the
squirrels and the organism going after
them
Background Information
• Illustrate and discuss the trophic levels of
the squirrels and their predators
Background Information
• What effects can pollution have on the
squirrel population, the environment
• What effect can an increase in the squirrel
population have on the environment
Background Information
• What is urbanization and what affect could
it have on the environment and/or the
squirrel population
References
Question and Hypothesis
• Write the question
• and your hypothesis:
– If……………. Then ……………….
– Or
– I believe …………………. Because …………
Materials
• List the materials needed for your
simulation
Procedure
• What are the steps to your simulation. Be
sure to include
– Several generations of squirrels
– Data to be collected
– How will the data support the hypothesis
Data
• Insert or construct your data table must
also be in your journal
Data
• Graph your data
Data Analysis
• Is there any sign of bias
• Do you see any trends
• Can you make any predictions
Data Analysis
• Define independent variable, what is yours
• Define dependent variable, what is yours
• What safety precautions and/or equipment
will you need
• What might be some sources of error in
your design
• Does the data support your hypothesis,
why/why not
Data Analysis
• Compare and contrast your simulation to
the moth situation
• Place image here
Data Analysis
• Show the relationship between squirrels
eaten and those surviving and reproducing
(ratio and proportion)
Summary
• Discuss your findings relate your results to
populations of gray squirrels
• State the phenotypes of the squirrels
• Describe the relationships among
organisms in the forest
• Discuss how environmental pressure
affects the squirrel population
Conclusion
• Does your data confirm, modify or reject
yor hypothesis. Use the data to support
your answer
Images