Which histogram shows a population that’s all one color?

Which histogram shows a population with a lot of variation?

Which histogram shows a population with mostly yellow ostrilopes and some variation?

Which histogram shows the same variation as histogram B but a different distribution of traits?

What information can you gather about the two generations below?

Was there variation in Generation 1?

Was there variation in Generation 2?

Do:

·  Open the Natural Selection Simulation and open the mode: Fur and Temperature A.

·  Change the temperature of the environment to cold (Level 1) by moving the    Temperature slider.

·  Press RUN and observe the population for at least 50 generations.

·  Press ANALYZE and compare starting and ending histograms.

Why do you think the distribution of fur traits changed over time?

CFS:

• accurately uses visual data to draw conclusions on population variations

• describes the cause and effect relationship between environmental factors and species traits

Predicting Fur Traits in a Cooling Environment

Use the Modeling Tool activity: Fur and Temperature, Population B to show your prediction about how the distribution of traits in Population B will change as a result of the environment becoming cold.

Goal:

Predict how and why Population B will change after the environment changes from warm to cold.

Do:

Analyze Histogram 1 and label that histogram with any Trait labels that apply.

• Predict Histogram 2 by shading in the bars for the different trait levels.

Predict the traits in Generation 2 when the environment changes from WARM to COLD