Types of Natural Selection

An extreme phenotype is favored causing the alleles to shift toward that phenotype

• Disruptive Selection
• Directional  Selection
• Stabilizing Selection
• Artificial Selection

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Genetic diversity decreases and individuals at the center of the curve have higher fitness.

• Disruptive Selection
• Directional  Selection
• Stabilizing Selection
• Artificial Selection

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Natural selection can best be defined as the _____.

• survival of the biggest and strongest in a population
• survival and reproduction of those in the largest area
• elimination of the smallest organism by the biggest
• survival and reproduction of those that are best adapted

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Characteristics that allow a population to become better suited to its environment

• accommodation
• adaptation
• variation
• selection

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What do you think is an adaptation?

• A trait that helps an organism adapt to its environment
• An organism that survives best in an environment
• A person who studies adapting animals
• a random chance event that shapes the population

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Which of the three graphs shows stabilizing selection? The original population is shown with a solid line.

• A
• B
• C

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Which of the three graphs shows disruptive selection? The original population is shown with a solid line

• A
• B
• C

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If finches with large beaks and finches with small beaks increase in a population while finches with average sized beaks decreases, which pattern of natural selection has occurred?

• Directional selection
• Disruptive selection 
• Stabilizing selection

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Robins typically lay fours eggs. If more then four eggs are produced then the baby chicks are malnourished while smaller egg numbers result in no viable (able to live) baby chicks. This is an example of

• stabalizing
• disruptive
• direction
• none of the above

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What type of natural selection is this?

• Disruptive Selection
• Directional Selection
• Stabilizing Selection
• Sexy Selection

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