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Lesson 05.02: Evolutionary Relationships

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Taylor Sanderbeck

on 13 December 2013

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Transcript of Lesson 05.02: Evolutionary Relationships

5 different colors of paper cut into 1 cm × 1 cm squares (at least 100 squares of each color)

Multicolored fabric or newspaper, approximately 1 meter × 1 meter

1 or 2 partners (friends or family)
How does a population change as a result of natural selction?
Lesson 05.02: Evolutionary Relationships
The prey will be represented by the small 1 cm × 1 cm squares of paper and the habitat is represented by the 1 meter × 1 meter piece of fabric. Hypothesize which color prey you think is most likely to be captured by the predator and which color prey is most likely to survive, and then record your hypothesis. Be sure that your hypothesis includes explanations for your predictions.
Have the two partners (prey) stand with their backs to the habitat while you scatter 20 squares of each color randomly on the fabric. Try to achieve a uniform distribution, and be sure to separate any that are clumped together.
Have the partner(s) randomly pick up the prey as fast as they can. Have them stop when they have collected a total of 75 prey, leaving the other 25 remaining in the habitat.
Count the number of survivors of each color. Each surviving prey has three offspring of the same color, bringing the total population back up to 100. Record the number of each color in the next generation in your data table.
Count out the correct number of each colored prey and scatter them on the fabric. Repeat the process two more times, for a total of three generations.
Color Blue Red Yellow Purple Green
Generation 0: 20 20 20 20 20
Generation 1: 16 20 20 20 24
Generation 2: 28 16 16 16 24
Generation 3: 40 4 11 24 20
Create a data table containing a tally of the number of each color of prey in each generation:
Generation 1
80% 100% 100% 100% 120%
Generation 2
140% 80% 80% 80% 120%
Generation 3
200% 20% 55% 120% 100%
Reflection Qustions
How do the original and surviving prey populations compare?
There seemed to be more purple and blue due to the camoflage.
How did the colors of each type of prey affect its population size over time?
The blue and purple population is dominant. I believe over time that there will be two colors extinct.
What color(s) seemed to camouflage the best in this habitat? What color(s) seemed to stand out the most?
Blue and purple then red stood out the most.
How do you predict the data would change if you continued? Explain your answer.
I think red would end up extinct and some others would be rare.
Identify at least two things that are unrealistic and two things that are realistic about this exercise.
The predator could randomly pick his prey anytime and the prey has no way of escaping.
Describe other adaptations besides color that could affect an individual’s survival.
Faster running, better hiding, and better defenses against predators.
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