Study Guide > Sexual_Selection Willow Canyon High School BIOLOGY: Experimental Question: How does pr

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Sexual Selection

Name:

CJ Sagalongos

Go to the Sexual Selection Simulation on Biology Simulations

1. Experimental Question: How does predation pressure affect coloration?

Identify the independent variable:

relative predation pressure on this species

Identify the dependent variable:

changes in the brightness of males in a population.

Write a hypothesis:

Brightly colored males are more likely to produce offspring, but are also more likely to be eaten by predators.

2. Select a starting percentage for bright males and a number of generations.

Starting % Bright:

50%

Generations:

5

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3. Select 5 predation pressures and run the simulation 3 times on each. Record your data (final male coloration frequencies) below.

Predatio n Pressure 10

20

30

40

50

Coloratio n

Trial 1

Trial 2

Trial 3

Average

Bright

0.4

0.4

0.4

0.4

Medium

0.08

0.1

0.08

0.09

Dull

0.02

0.01

0.01

0.01

Bright

0.4

0.4

0.4

0.4

Medium

0.1

0.1

0.1

0.1

Dull

0.02

0.03

0.02

0.02

Bright

0.4

0.4

0.4

0.4

Medium

0.1

0.1

0.1

0.1

Dull

0.03

0.03

0.03

0.03

Bright

0.3

0.3

0.3

0.3

Medium

0.1

0.1

0.1

0.1

Dull

0.03

0.04

0.05

0.04

Bright

0.3

0.3

0.3

0.3

Medium

0.1

0.1

0.1

0.1

Dull

0.06

0.05

0.04

0.05

4. Conclusion: My hypothesis was proven correct, brightly colored males are more likely to produce offspring, but are also more likely to be eaten by predators as proven by the chart since the brightly colored had higher frequencies.

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5. Compare your results to other students. Did the starting % or number of generations chosen make a difference to the results? Explain.

When I changed the starting number of generations to something different the results came out the same having the bright colored ones have higher frequencies although the numbers may be different.

6. Research, describe, and explain a real-life example of sexual selection.

This selection allows certain members of the population to reproduce more than others, therefore passing on their traits more than others. Things like elaborate feathers or absurdly large genitalia, are put on display to attract mates. (peacocks)

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