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5.02 Evolutionary Relationships

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Jen Rogers

on 4 August 2014

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Transcript of 5.02 Evolutionary Relationships

Conclusion
How do the original and surviving prey populations compare?
How I saw everything was that more blue and purple population because of camoflauge. An by looking at the chart you can see that the blue and pruple overopulated more than any other color.
How did the colors of each type of prey affect its population size over time?
Well Blue and Purple seemed to be the dominate trait or color here over the other colors. Seeing these effects I would predict that yellow and green would be exticnt because there color is rare.
What color(s) seemed to camouflage the best in this habitat? What color(s) seemed to stand out the most?
The color that camouflage the best was blue and purple. Red seemed to stand out the most . It seems that its to noticeable.
How do you predict the data would change if you continued? Explain your answer.
For my opinion if I continue red would no longer be as well as other colors that seem to become rare every time I continue with the data. And colors like yellow and green would also go extinct because of its rarerness.
How would these results change if the colors or patterns of the habitat were to change?
Well defintely I would think that if we change the colors, that would comouflage the best would change because obviously we are changing the colors. So this is really obviously if you change the color and pattern the results would change depending the colors.
Conclusion continued
Data and Observations:
Create a data table containing a tally of the number of each color of prey in each generation:
Color 1.__Blue__ 2.__Red__ 3.__Yellow__ 4.__Purple__ 5.__Green__
Generation 0 25 15 18 10 28
Generation 1 18 25 13 19 26
Generation 2 27 18 15 21 29
Generation 3 45 10 11 13 34
Natural Selection Lab
This hands-on laboratory exercise is a highly simplified model that attempts to simulate evolution by means of natural selection. Predators will act as agents of selection on their prey, a species whose members vary in color. We will assume that color is an inherited trait. Small squares of paper will represent the prey, which will be spread out of a piece of printed colored fabric that will serve as the habitat. The predators (you) will prey upon the population, with the surviving members reproducing and passing along the genes for color.


5.02 Evolutionary Relationships
Generation 3
Identify at least two things that are unrealistic and two things that are realistic about this exercise.
Two unrealistic things would be there would be alot more predators than just two predators. And that those generations of them would start at an even number like for example 22. Two Realistic things are that the predators of course would choose pray randomly and second that the population would vary.
What traits could help a predator be more “fit” in this model environment?
Well probably being able to run really fast or blend in better with the enviorment.
Describe other adaptations besides color that could affect an individual’s survival.
Being able to adapt to new enviorments. Being able to run fast enough to catch prey. Being able to comflauge good. Being able to develop defenses all of these are key in order to survive.
Problem:

How does a population change as a result of natural selection?
Materials:

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)
Procedure:

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.
Generation 1
Generation 2
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