variation in eastern gray squirrels add name. background information natural environmental pressures...

Variation in Eastern Gray Squirrels

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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

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