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5.02 Natural Selection Lab
Transcript of 5.02 Natural Selection Lab
How does a population change as a result of natural selection?
I believe that the colors that are more easy to spot will be eaten or taken in by the predators. A population changes as a result of natural selection by survival of the the best animals. Because of the traits that are passed down from generations, those with the colors most a kin to the surrounding area will survive.
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)
Materials and Procedure
Yellow and White seem to have taken the brunt of the force, they are the two brightest and notable of the bunch. The three other colors seem to have faired very well.
Data and Observations
◾How do the original and surviving prey populations compare?
Those with the brightest colors' populations declined, while the others thrived.
◾How did the colors of each type of prey affect its population size over time?
The brighter the color, the smaller the population became over time.
◾What color(s) seemed to camouflage the best in this habitat? What color(s) seemed to stand out the most?
Blue, Red, and Green seemed to camouflage the best. White and Yellow stood out the most.
◾How do you predict the data would change if you continued? Explain your answer.
I think that eventually White and Yellow would become extinct.
◾How would these results change if the colors or patterns of the habitat were to change?
If the habitat was to change to a brighter color then the less bright colors would stand out.
◾Identify at least two things that are unrealistic and two things that are realistic about this exercise.
Realistic: The color of the prey against the habitat would effect it's survival,
and eventually the population of the undesirable colors would swap or merge.
Unrealistic: The prey's food source was not included and neither was the environment specified.
◾Describe other adaptations besides color that could affect an individual’s survival
Most alikely it would be any adaption would affect an individual's survival.
Natural Selection Lab
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.